Aquarium breach · minimax-m3.1-flash

Let me plan the simulation.

Design:
- Canvas 1200x800 viewport (browser tool uses 1200x800).
- Room: floor at y=740, walls at x=40 and x=1160 (room walls), back wall.
- Tank: glass rectangle, x from 300 to 700, top y=140, bottom y=640 (sits on floor/stand? Let's make tank sit on floor... but then water spilling needs floor. Let's put tank on a stand with legs, floor at y=740, tank bottom at y=620).
- Water inside tank with waterline y (starts at 220).
- Crack: vertical crack on left or right side below waterline. User drags a visible crack vertically. So there's a crack handle on a side (maybe toggle side selection). Let's allow drag on either the left or right glass panel; crack marker follows mouse vertical position constrained below waterline and above tank bottom. Clicking on the glass side sets the crack position. "Let the user drag a visible crack vertically on one side below the initial waterline" — so a draggable crack handle. Implement: on mousedown near either side glass, grab the crack (or if crack is on the other side, move it there). Then drag vertically to reposition. Constrain to below initial waterline (y > waterline) and above tank bottom.

Also allow switching side by clicking on the opposite panel.

- Breach button: breaks panel around the opening (draw glass shards flying). The opening is a vertical slot of height ~60px centered at crack y, on the chosen side.
- Water exits as gravity-curved jet: particles spawned at opening with horizontal velocity outward, gravity applied, so parabola. Water level falls continuously: waterVolume decreases as outflow flux depends on head (waterline y vs opening y): Torricelli-ish flux ∝ sqrt(2 g (waterline - openingY)) times width. Outflow stops when waterline <= openingY.

- Puddle: escaped water particles land on floor and form spreading puddle constrained by floor and room walls. Approach: keep a puddle as a set of particles with mass; when particles hit floor, they merge into puddle represented by a height field (1D array across x) — simplest: track puddle volume per column? A simple approach: escaped water particle that hits floor converts into "puddle mass" deposited at that x; then we render puddle as a smooth surface: maintain array of columns with volume, spread slightly each frame (diffusion), and compute height = volume/(width). Constrain spread by walls and tank base. Let's do that: puddleCols array of N=300 columns over floor; deposit adds; each frame, diffusion transfer toward neighbors limited by differences in surface height (like shallow water relaxation). Height = colVol/colWidth; transfer = (h[i]-h[i+1]) * k. This makes puddle spread and level out, walls confine.

- Objects: rocks (sink, heavy, sit on tank floor), toy (floating at waterline, bobs), plants (rooted at tank bottom, bend under current), fish (swim, initially swim against current, then get sucked and swept through breach).

Physics for objects inside water: buoyancy (rock sinks because density > water; toy floats), drag (linear damping in water), current (flow field near the opening producing suction toward the opening and outward).

- Objects swept through breach: when an object's position crosses outside the tank through the opening region, it transitions to gravity-driven motion (no buoyancy, reduced drag) and collides with floor (bounce, settle).

- Glass fragments: rotating, collide with floor and walls, resistance in water (fragments inside water get heavy drag, sink).

Implementation details:

State machine: 'idle' (intact), 'breached'.

Entities:
- Water particles inside tank: just a filled rect with animated surface; plus jet particles.
- Jet particles: {x,y,vx,vy,alive}. Spawn at opening with vx = ±(some speed based on head), vy small downward. Gravity. When below floor or in puddle region -> deposit into puddle and remove. When they re-enter tank (unlikely) skip.

Actually the jet: particles emitted at opening. Particle physics with gravity gives downward curve. Also they should exit roughly horizontally. Good.

- Water level: levelY increases (falls) over time. Volume conservation: tank cross-section width * (tankBottom - levelY) = remaining water. Outflow rate dV/dt = C * sqrt(2*g*h_head) * w where h_head = levelY - openingY (head above opening) ... Actually head should be water level above the opening bottom. Flux Q = Cd * A * sqrt(2 g H) where A = opening width (60px scaled), H = levelY - openingY. Then levelY increases by Q*dt/(tankWidth). Once levelY >= openingY (water no longer reaches opening), outflow stops.

Mapping px to meters: choose scale so g in px/s² = 900, opening width 60px => A in px terms: treat 1 px = 0.01 m maybe. Simpler: work in pixel units, use g=1400 px/s², flux in px³/s: Q = 0.6 * A(px) * sqrt(2*g*head(px)) in px²/s... units: A*velocity = px²/s. Volume in px² (cross-section per unit depth) so level change = Q*dt / tankWidth(px). That's fine: Q = Cd * A * v where v = sqrt(2*g*head). v at head=100px: sqrt(2*1400*100)=529 px/s, times A=60 -> 31700 px²/s, /tankWidth 380 -> 83 px/s level drop. That's fast. Maybe scale down: v = 0.35*sqrt(2*g*head). Let's tune by testing.

Also need outflow to visually match jet: jet particles per second proportional to flux.

Fish: swimming in tank with wander; when breached, they feel current: velocity field pulls toward opening; if a fish enters the opening zone (x beyond tank side within opening vertical range, near crack), it gets swept out: convert to "escaped" mode, gravity motion, exits through breach, falls to floor.

Plants: rooted, drawn as swaying bezier; bend based on current magnitude (angle toward flow direction). Some plants can drift out if flow strong? "plants bend or drift" — implement bend mainly; small free plant (a loose algae clump) that drifts out through opening.

Rocks: sink to bottom, stay, but if flow strong enough could be sucked out? "Movable objects that fit the opening can be carried out by the flow." Rocks bigger than opening won't fit. Toy fits (small). Fish fits. A small rock fits.

So: each object has size; if object's radius < openingHalfHeight and it reaches the opening region, it gets carried out.

Drag in water: velocity damping; outside water: gravity + air drag + floor bounce.

Buoyancy: for objects in water, apply gravity minus buoyancy accel = g*(1 - rho_obj/rho_water). rock rho 2.5 -> sinks fast; toy rho 0.6 -> floats up toward surface; fish neutral-ish with slight buoyancy.

Friction on floor: settle.

Glass fragments: spawned at breach, rotate, collide with tank walls/floor; if inside water region, heavy drag, sink slowly.

Rendering: nice-ish visuals. Gradient water, glass panels with highlights, caustic-ish. Keep it reasonable.

UI: Breach button, Reset button, side indicator, crack hint text. Crack handle: a vertical jagged crack drawn on the side panel with draggable grip (circle) — the whole crack draggable vertically.

Let's write the code carefully.

Layout constants:
- Canvas 1200x800, DPR scaling.
- Floor y = 745 (floor top), room walls at x=25 and x=1175.
- Tank: left=330, right=760, top=150, bottom=620. Tank width 430, height 470. Tank stands on a stand? Simpler: tank bottom at 620, then a stand from 620 to 745? Actually let's put the tank directly on the floor region: bottom = 660, floor top = 700, small stand. Hmm water falling to floor puddle. Let's make tank sit on a stand (wooden) at bottom 620..660, and floor at 700. Puddle spreads on floor from x=60..1140.

Water initial level: y=230 (inside tank top 150, so ~80px of air above water). Crack below waterline: crack allowed y in [250, 600].

Opening: centered at crack y, height 70.

The crack marker: drawn on the chosen side's glass (inner edge). Drag: pointer down anywhere on left/right glass panel region below waterline → set side & crack y, drag continues. Also a grip handle.

Breach state: opening exists. Draw broken glass edges (jagged) around opening.

Now the flow field for objects: velocity field inside water near the opening: for a point in water, compute suction toward opening: direction from point to opening center, magnitude ∝ 1/(d+40) * flowStrength. Plus tangential. And current near opening drives water outward.

Jet particles: spawn at opening position (x = tank side ±), with vx = ±v0, vy = small random. Gravity curves them down.

Water inside the tank near the opening should also visibly stream toward opening: draw some streamlines/particles inside tank moving toward opening and out.

Puddle: columns array over floor from x=40..1160 with N columns width = (1160-40)/N. Deposit: col index from x. Each frame diffuse. Rendering: for each column, height h; draw path of puddle top from left to right, fill with blue gradient. Floor collision: the floor line at 700; puddle surface y = 700 - h.

Constraint by walls: deposition clamped within [40,1160]; diffusion clamped. Also tank stand blocks puddle? Puddle could flow under tank stand... simplify: stand is a solid obstacle in the middle? Puddle spreading across the whole floor including under the tank region is fine; the tank sits above the floor on legs at x 340..750. Let's make the tank sit on a stand with legs, so puddle flows around legs. Simpler: stand is a solid block from x=340..750 at y=620..700? Then water hitting floor under tank is odd. Better: tank on 4 legs; legs are thin obstacles; puddle flows under. I'll just render legs thin and ignore collision for puddle (visually fine, or treat leg columns as blocked in diffusion — minor). I'll add thin leg obstacles to diffusion as barriers for realism.

Water level falls: levelY. Water rect drawn from levelY to tank bottom.

Also water draining: when level approaches opening, outflow weakens. Flux ∝ sqrt(head). Also the flow strength near opening for objects ∝ flux.

Fish behavior: fish have own swimming, but with flow they get dragged. "fish initially swim against the current before some are swept through the breach": implement fish swim target velocity; when breach occurs, fish detect current and try to swim against it (add steering away from opening), strength decays over time (fight gives up) so eventually some are swept through. Only fish near the opening get swept; fish far away are fine.

Let's implement fish state: 'inside' with wander velocity; 'escaped' outside.

Sweeping: check if fish x crosses tank side within opening y-range and |x - side| < some -> becomes escaped: vx = outward speed, vy = 0.

Objects in water (rocks, toy) near opening: get dragged toward opening; if small enough to fit (size < opening height) and reaches opening x, they get carried out -> escaped gravity motion.

Plants: bend angle proportional to local current; a free-floating plant (weed clump) can drift out.

Let's now write the code. It'll be long but fine.

Physics constants:
g = 1500 px/s².
Water drag: for in-water objects, dv/dt = -k*(v - v_water) + g*(1 - rho/rho_w). k ~ 3.5.
Outside water: dv/dt = -k_air*(v) + g, k_air = 0.2. Plus wind? no.

Now write index.html.

Structure:

```html
<!doctype html>
<html>
<head>...styles...</head>
<body>
<canvas id="c"></canvas>
<div id="ui"> buttons </div>
<script> ... </script>
</body>
```

Canvas full window 1200x800 fixed? Make it fill window with resize handler; but browser tool viewport 1200x800. Use responsive canvas with fixed logical coordinate system? Simpler: use CSS to make canvas fill viewport, and set canvas size = clientWidth*dpr; keep world coords = CSS pixels, and scale constants based on min dimension? If window is 1200x800, constants fine. I'll define layout relative to canvas size: floorY = H-100, tank computed from W,H. Let's compute layout on resize:

tank: width = min(430, W*0.42), left = W*0.30, right = left+width, top = H*0.16, bottom = H*0.76 (stand below to floor at H-60?). Let's define:
floorY = H - 70
standH = 40
tankBottom = floorY - standH
tankTop = H*0.13
tankLeft = W*0.32, tankRight = tankLeft + tankWidth, tankWidth = min(440, W*0.38)
waterTop = tankTop + (tankBottom-tankTop)*0.18 (i.e., levelY initial).

Compute in JS with a layout() function.

UI: HTML buttons overlaid top-left: Breach, Reset, plus side toggle maybe. Also status text.

Let me write code now.

Key functions:
- reset(): build scene.
- update(dt), render().
- pointer handling for crack drag.

Let's code.

```js
const cv = document.getElementById('c'), ctx = cv.getContext('2d');
let W,H,DPR;
function resize(){ DPR=Math.min(2,devicePixelRatio||1); W=innerWidth;H=innerHeight; cv.width=W*DPR; cv.height=H*DPR; cv.style.width=W+'px'; cv.style.height=H+'px'; ctx.setTransform(DPR,0,0,DPR,0,0); layout(); }
```

layout computes L (layout object) and if scene exists reposition? On resize just recompute and rebuild? Simplest: on resize, reset scene (rare). I'll keep objects in relative-ish; simpler to rebuild scene on resize if not breached. Just call reset() on resize.

Objects definition:

```
const scene = { waterLevel, breach:false, crackSide:'left', crackY, opening:{y,h}, flux, ... }
```

Entities arrays: rocks[], plants[], fishes[], toy, debris[] (glass), jet[], puddle (Float32Array cols), streams[] (inside-tank flow particles).

Let me write the code in full.

Puddle details:
puddleX0 = 40, puddleX1 = W-40, NP = 240, colW = (puddleX1-puddleX0)/NP.
cols = Float32Array(NP) volume (px of depth * colW). height[i] = cols[i]/colW.
Deposit(x, amount): i = clamp(floor((x-puddleX0)/colW),0,NP-1); cols[i]+=amount.
Diffusion: for each i, compute surface height hs = cols[i]/colW; flow between i and i+1: dh = hs_i - hs_{i+1}; transfer = dh*0.25 (limit). Apply symmetric. Obstacles (legs) block.

Rendering puddle: build path across columns with surface y = floorY - height, clamp min floorY.

Jet particles: {x,y,vx,vy,life}. When y > floorY (and beyond puddle surface) → deposit and remove. Also when it lands in puddle region, deposit. Just deposit when y >= floorY - puddleHeight(x).

Also particles that land should reduce visual "jet" — fine.

Jet spawn: rate proportional to flux: spawnAcc += flux*0.02 particles/s? Let's tune: flux px²/s; spawnRate = flux/ (300) per second maybe. Tune visually later.

Water leaving also should show "outflow weakens": particle speed v0 = 0.5*sqrt(2*g*head) and spawn rate ∝ head^0.5. Good.

Additionally, the water in tank should show a swirl/stream toward opening: create "intake" particles inside tank near opening moving toward opening and then transitioning to jet particles. That's nicer. Implement: stream particles spawn in a region near opening inside water with small velocity toward opening; when they reach opening plane, convert to jet with velocity = v0 outward. Let's do that: spawn inside water near opening at random offsets; they move toward opening center at speed ~ v0*0.5; when reaching the side plane within opening range, become jet particle with vx=±v0, vy = small.

Simpler and robust: directly spawn jet particles at the opening plane, positioned randomly along opening height, vx outward = v0, vy = random small, gravity. Plus draw a "throat" glow. I'll do the intake-particle approach partially: spawn at opening plane but with x slightly inside so it looks like it comes from inside. Let's do particles starting inside tank at x = side ± (into tank 10-40px), y random in opening, velocity toward outside with v0, plus slight upward/downward randomness → they cross plane and curve. Good enough.

Objects in water current field:
```
function currentAt(x,y){
  if(!breached) return {vx:0,vy:0,mag:0};
  const o = openingCenter; // on side
  const dx = o.x - x, dy = o.y - y; const d = Math.hypot(dx,dy)+30;
  const strength = scene.flowMag; // ~ flux-based
  // suction toward opening
  return {vx: dx/d*strength*(1/ (d/120)), vy: dy/d*strength*(1/(d/120))}
}
```
where flowMag = min(140, flux*0.006) etc.

Apply to objects in water: they get pulled. Also add general outward push.

Objects:
rock: {type:'rock', x,y,vx,vy,r, density:2.6, shape polygon}
toy: {type:'toy', x,y,vx,vy,r, density:0.55} — floating boat/rubber duck drawn.
fish: {type:'fish', ...}
plant: {type:'plant', x (root x), y(bottom), height, bend, phase}
weed: {type:'weed', free floating, can be carried out}

Fishes swim: each has angle, speed; target velocity = swim dir + current. "initially swim against the current": when breached and currentMag > threshold, fish within influence radius steer opposite to current, with fight factor decreasing over time since breach: fight = clamp(1 - elapsed/12, 0,1). Fish far away ignore.

Sweep out check: if fish x < tankLeft - 4 and opening on left and y within opening range → escaped. Actually escaped state applies when object crosses the tank wall through the opening: check for each in-water object: if side left and x < tankLeft + 2 and y within [opening.y - h/2 - r, opening.y + h/2 + r] → pass: it goes through: set state 'escaped', vx = -v0*0.8.

But objects need to actually reach the plane. With suction toward opening they will.

Fitting: object must fit: size (height) < opening height * 0.9 → rocks too big won't pass; instead they get pushed against the glass and stay (or tumble). We check fit before letting them pass.

Escaped objects: gravity, collide with floor (bounce with restitution 0.3, friction), collide with room walls.

Debris (glass fragments): spawn at breach, small triangles with rotation and velocity outward+up, gravity; if inside water region (x within tank, y>level) heavy drag & sink; collide with tank walls/floor (floor = stand top or ground?). Fragments inside tank fall to tank bottom. Fragments outside fall to floor.

Let's code carefully but efficiently.

Rendering the water in tank: gradient blue, wave surface with sine, plus reflection.

Glass panels: draw tank as rectangle with thick translucent borders; when breached, the side with opening shows jagged broken edges.

Crack rendering (before breach): a jagged vertical line on the glass at crackY with a small handle circle; pulsing glow.

Break animation: on breach, set breakT=0; animate opening expanding from 0 to full over ~0.6s, spawn debris, camera shake.

Now water level fall: levelY += dV/width where dV = Q*dt.

Q = Cd * A * v, A = openingHeight (px, treat depth 1), v = 0.55*sqrt(2*g*head), head = levelY - openingCenterY (head above center). Use head above bottom of opening? Use head above opening top: H = levelY - (opening.y - opening.h/2). Outflow stops when levelY <= opening.y - opening.h/2? Spec: "stops when water no longer reaches it" — stops when water level drops to the bottom of the opening? Actually water reaches the opening as long as level is below the top of the opening (level > opening bottom). Water below the opening bottom no longer reaches it. So outflow stops when levelY >= openingBottom (opening.y + h/2) using y-down coords: opening spans yTop=opening.y-h/2, yBottom=opening.y+h/2. Water occupies below levelY. Water reaches opening while levelY < yBottom. So condition: if levelY >= yBottom → no outflow. Head H = yBottom - levelY (depth of water above the bottom of the opening)... Hmm pressure at the opening center = rho g (levelY - openingY) if levelY > openingY. Use head H = max(0, levelY - openingBottom)? That underestimates. Use H = max(0, levelY - openingCenterY) but only flow while levelY < yBottom. That's fine and consistent-ish.

Let's do: head = max(0, levelY - openingCenterY); if levelY >= yBottom → Q=0.

Flux Q = 0.6 * A * sqrt(2*g*head) with A = opening.h (px). g=1500. At head=200: sqrt(600000)=775, *0.6*70=32550 px²/s; /tankWidth 430 = 75 px/s fall. Tank water depth initial ~ 330 px; total fall to bottom 330 → time ~ maybe 8-15 s as head shrinks. sqrt decay: total time integral. depth fall rate ∝ sqrt(head) → time ∝ sqrt(depth). Reasonable, maybe a bit fast; tune coefficient 0.35.

Water volume = tankWidth * (tankBottom - levelY). When it drains to opening bottom, remaining water stays below. Good.

Also: "Escaped water forms a spreading puddle constrained by the floor and room walls" — puddle grows.

Now let's write it. I'll write the whole file in one go.

For plant bending: plant at root (tankBottom), height h; bend angle from current at its midpoint; sway with sine.

Fish drawing: ellipse body + tail + eye; rotate to heading.

Toy: rubber duck-ish shape (circle + smaller circle + beak) floating; its y follows water surface with bobbing; if it gets carried out, gravity.

Rocks: polygons with shading, sitting on tank bottom (they sink and rest on bottom). When breached, strong current near opening might tug them.

Let me write code.

Also add: clicking Breach with crack too high (above waterline) — we constrain crack below initial waterline so fine.

Crack drag: pointerdown: check if near crack handle (within 30px) → drag mode. Else if within tank left/right glass band (x within [tankLeft-30,tankLeft+30] or [tankRight-30, tankRight+30]) and y between waterline+10 and tankBottom-10 → set side & crackY, start drag. Also allow clicking on glass to move crack directly.

Provide "side" indicator. Provide Breach button disabled until crack positioned? It's positioned by default maybe at left side below waterline; requirement says user drags it. I'll start crack on left at y = waterLevel+120, and user can drag to reposition (and switch sides by dragging to the other panel). Breach button enabled always but let's require the user to have interacted? Better: enable Breach always; but verification says "Position the crack, trigger a breach". I'll keep it enabled but show hint text.

Let's write.

Rendering order: background room, floor, puddle, tank stand, tank back glass + water + plants + rocks + fish + toy, front glass, crack, jet/debris, escaped objects in room, HUD text.

Escaped objects drawn after tank (in front) but if they're behind tank? they're outside tank so fine.

Let's write the code now, then test with browser.

I'll write substantial but organized code.

For the jet particles rendering: use lines with alpha, color light blue.

Also add splash when jet hits floor: small droplets.

Time to write.

One more: "Objects leaving the water transition to gravity-driven motion and collide with the floor." handled by 'escaped' state.

"Glass fragments rotate, collide, and experience resistance in water." — debris with rotation, drag in water, collide with tank walls & floor.

Let me write the file.

Code sketch:

```js
const G=1500;
let L={};
function layout(){
  const floorY=H-72;
  L.floorY=floorY;
  L.tankW=Math.min(460, W*0.40);
  L.tankL=W*0.5-L.tankW/2;
  L.tankR=L.tankL+L.tankW;
  L.tankT=H*0.12;
  L.tankB=floorY-46;
  L.waterY=L.tankT+(L.tankB-L.tankT)*0.22;
  L.openingH=Math.min(78, L.tankB-L.tankT);
  L.px0=30; L.px1=W-30;
  L.np=220; L.colW=(L.px1-L.px0)/L.np;
}
```

Scene object with init().

Now entities creation:

rocks: 4 rocks with random polygon shapes, positioned near bottom, radius 18-30.
plants: 3 plants at bottom.
weed: 1 free floating weed (small) at mid water.
fish: 5 fish.
toy: 1 rubber duck at surface.

Let me write the render of each.

I'll now write full file.

Puddle diffusion with obstacle columns for legs: legs at x = tankL+15 and tankR-15 etc. Legs block flow: mark columns near legs as walls (don't transfer across). I'll implement barrier array.

Let me write final code.

For fish "swim against current then swept": give each fish a `fight` timer; global elapsed since breach. Fish within current influence: they compute current vector c; desired velocity = swimDir*speed - c*fight (fight factor decreasing over time: fight = clamp(1.2 - elapsed/10,0,1)). Also fish try to avoid the opening: steer away from opening point.

Ok writing now.

Also swept-out fish need to be swept "through the breach" — so allow passage when fit check: fish height ~ 14px < opening 78 → fits. Rock r=26 (52 diameter) < 78 → hmm rocks would fit. Make rocks bigger r 30-40 → don't fit. But "Movable objects that fit the opening can be carried out" — the toy and weed fit, and maybe a small pebble fits. Add a small pebble that gets carried out. Good: pebble r=10 fits.

Fitting check uses object's height (2r) < openingH*0.8.

Now let's write. I'll include a HUD with instructions and readouts (water level %, outflow rate, escaped count).

Writing the filenow.

Let's load in browser and inspect console.

Note: L.np used in S.water creation at module init before layout() is called → L.np undefined → error! S is defined before layout() is called (resize called later). `new Float64Array(L.np)` with undefined → error "Invalid array length"? Float64Array(undefined) → length 0? Actually new Float64Array(undefined) gives length 0 (undefined → 0). Similarly S.legCols. Then resize() → layout() sets L.np, then reset() fills. But S.water was created with length 0 and never resized → deposit fails. Need to allocate in layout/reset. Let me fix: allocate arrays in reset() after layout.

Also S.openingH set in reset.

Let me fix by re-allocating arrays in reset().

Scene renders. Issues: rocks are floating in the water (they should sink to bottom). Rocks have buoy = G*(1-dens) negative so they sink... but they're drawn mid-water. Wait, they should sink. buoy = G*(1-dens/1.0) = 1500*(1-2.5) = negative → sinks. But then submerged damping: b.vy += (c.y*1.7 - b.vy)*3.0*dt — that damps velocity toward 0 heavily, fighting gravity. Because it's applied each frame, vy is pulled to 0 with rate 3/s, gravity adds 1500*dt per second → terminal velocity where 3*|vy| = 1500 → vy=500 down. Hmm but the "c.y*1.7" term pulls velocity toward current (0) so vy → -500 which is downward since positive y down. Wait buoy negative → vy negative → upward! Sign: gravity is +y (down). Buoyancy should reduce gravity: a = G*(1 - dens). dens 2.5 → a = -2250 → negative means upward. Wrong! Should be a = G*(1-dens) for downward positive: for dens>1, buoyancy exceeds gravity so net is upward... but a dense object sinks. Correct formula: net downward accel = G*(dens - 1) for dense objects. So a = G*(dens-1). Let me fix: buoy = G*(b.dens-1). Rock dens 2.5 → +2250 down. Toy dens 0.55 handled separately. Weed dens 0.92 → negative → rises. Good.

Also damping pulls vy toward c.y*1.7 which is 0 — with rate 3/s, terminal vy = 2250/3 = 750 down, ok but the target should be fluid velocity: drag pulls toward water velocity, gravity pushes. Equilibrium when drag*(vy) = gravity → vy = 2250/3=750 px/s — fast but fine; increase drag for realism? Actually then rocks fall quickly. Let's use drag coefficient 6 for rocks in water (viscous) → terminal 375.

Also rocks are drawn behind the water? They're drawn after water so they're visible. But they float — fix sign.

Also the weed appears mid-water (green star) fine.

Also the crack handle sits outside the tank on the left at x=348 (tankL=365? Actually tankL = W*0.5-235=365, handle at 347). OK.

Fish positions fine. Toy floats.

Let me also check the "Breach" button enabled state: updateHud disables breach if crackY < waterY0+14. crackY = waterY0+120 fine → enabled? The screenshot shows Breach button enabled (red). Yes.

Now fix buoyancy sign, rock drag.

Also the tank interior: water drawn from levelY to tankB, good.

Next: test the drag and breach.

Additional concern: rocks resting on tank bottom but I set b.rest and the "floor of tank" check uses inTank which requires x within tank. fine.

Let me fix and then test breach.

Also weed: `b.vy += G*(1-b.dens)*0.35*dt;` with dens 0.92 → +0.28*1500 = +420 downward... that's wrong direction for buoyant weed (should rise). Actually weed should stay roughly neutral near surface: use G*(b.dens-1) = -120 → rises slightly. But the target-Y spring already holds it near the surface. Let me change to G*(b.dens-1)*0.35.

Also the "toy" logic uses targetY relative to S.levelY — fine.

Also the toy buoyancy: handled by spring.

Now test.

Rocks now sink (mid-frame is falling). Good.

Now test the breach: drag the crack to a position, then click Breach. Crack handle is at (347, 325). Let me drag it down to ~ (347, 420) and then click Breach at (70,62).

Drag: click at handle, move to y=430, release.

Drag works (crack now at 338px). Rocks have settled at the bottom. The weed clump is above the water surface though (it's drawn at ~y=170 above waterline 210). The weed target is levelY-26 but buoyancy pushes it up; it seems above water. Actually it's drawn at y=170 which is above the waterline (210). The weed's spring should hold it at levelY-26=184. It shows at 170 — it overshot. Also drawn above water, looks odd but ok-ish. Let's reduce weed spring gain / increase drag so it stays submerged. Change: targetY = levelY - 18, spring 2.4, and add drag. Minor.

Now click Breach andsample.

Breach happened, debris flying. But the water level is still 100% and outflow 0 — the screenshot may be taken immediately (frame 1). Let's take another screenshot a bit later. Note the screenshot is right after click.

Also notice: the opening drawn on left side appears as jagged pieces around x=360, y=380-470 (the crack was at 338+?). Actually the crack was at 338px offset from tank top → world y ≈ 92+338=430. Yes matches.

Wait — the water level is 100% and outflow 0 immediately after breach, that's expected at t=0 since flux computed... should be non-zero already. The DOM snapshot may be from before the next frame. Let's screenshot after a moment.

Problems:
1. Water level still 100%, outflow 0, no jet particles. The opening appears but no water flowing. Why? updateFlow: head = level - S.openingY where level=210 (waterY0=~210) and openingY = crackY world ≈ 430. head = max(0, 210-430)=0 → no flow! Bug: head should be water column above the opening = levelY - openingTop (opening top is above center). Since opening center is below the water surface, head = levelY - openingCenter is negative but water still flows (depth of water above the opening = levelY - openingTop). Correct: head should be measured from the opening's TOP: H = levelY - o.top (if levelY < o.top, no water reaches). So use head = levelY - o.top.

Also "outflow stops when water no longer reaches it": stops when levelY >= o.bot (water level below opening bottom).

Wait, with y down: water occupies from levelY downward to tankB. The opening spans [o.top, o.bot]. Water reaches the opening if levelY < o.bot. The pressure head at the opening = levelY - o.top (depth from surface to the top of opening)? For flow through an orifice, head = levelY - o.top (distance from free surface to the orifice's upper edge). Use that.

2. Also there's a weird dark rectangle at x=340,y=430 area outside the tank (the "hole" polygon fill drawn with alpha .55 covering outside). The dark rect looks like a solid black box from x~340-365, y 380-470. My hole polygon: for left side I drew moveTo(o.x,o.top) ... then lineTo(o.x-30,o.bot), lineTo(o.x-30,o.top) closing — that's the region outside the tank (left of glass) filled dark, which looks like a black box. I intended a dark hole inside the tank. Let me redo: the hole should be a dark area just inside the opening? Actually the opening is a hole in the glass; behind it (inside the tank) you see water. Drawing a dark region inside the tank at the opening would look like the hole. Better: draw the hole as a dark region extending slightly outward (the gap) but with low alpha, or skip it. I'll draw a subtle dark slot inside the tank (from o.x to o.x ± 12) to suggest the missing glass, plus bright jagged edges.

Let me restructure drawOpening:
- Draw jagged bright edge lines along the vertical opening on the glass line.
- Draw a dark translucent slot: for left side, rect from o.x to o.x+8 (inside tank) spanning the opening → dark gap.

3. The white swirl ellipses (current swirls) look odd/white — they're drawn with rgba(190,235,255,.30) but appear bright white-ish. They're at o.x + 26 etc. Fine but they're drawn in the water clip region, ok. Slightly reduce.

4. Weed still above water surface (y=170). Fix by stronger spring and less rise: targetY = levelY - 20, and the buoyancy term small.

Let me fix the head calculation first — that's the critical bug.

Also flux: A = o.h (86). v = 0.42*sqrt(2*1500*head). head at start = levelY(210) - o.top(430-43=387) → negative → no flow. After fix head=210-387 <0 still negative! Because the opening top is BELOW the water surface? No: o.top = openingY - h/2 = 430-43 = 387, and water surface is at 210 (above 387 in screen coords). So water surface y=210 < o.top=387 → the water surface is above the opening top → water covers the opening. Depth of water above the opening top = o.top - levelY = 387-210 = 177. In y-down coordinates, head = o.top - levelY.

So head = max(0, o.top - levelY) when levelY < o.top, but if the water surface is within the opening span (levelY between o.top and o.bot), head = o.bot - levelY (partial submergence).

General head = max(0, o.bot - levelY) is the depth of water above the bottom of the opening, which is the standard orifice head (using the lower edge of the orifice). But since flow through an opening is driven by the depth of water above the opening's centroid, using o.bot overestimates. Let me use: head = max(0, min(o.bot - levelY, (o.bot - o.top))) hmm.

Simplest consistent choice: head = o.bot - levelY (water column height above the bottom edge of the opening), capped by the opening height (max head = o.h when fully submerged). That gives: fully submerged → head = o.h (constant), so outflow doesn't weaken until the water surface approaches the opening. Hmm but spec says "Outflow weakens as the water level approaches the opening" — with cap it starts weakening when the surface enters the opening span. That's reasonable: as the surface descends into the opening, less of the opening is submerged → less flow. Let's implement:

submerged fraction of opening: the opening spans [o.top,o.bot]; water surface at levelY. The submerged part is from max(o.top, levelY) to o.bot, height hs = o.bot - max(o.top, levelY), clamped ≥0.
Effective area A = o.h * (hs/o.h) = hs.
Head H = hs/2 (depth above the centroid of the submerged part) → approx hs*0.5, or use (o.bot - levelY) full depth to bottom edge.

Use: H = max(0, o.bot - levelY) but only over the submerged portion; when fully submerged H = o.h (which is 86) — constant flow. That means the waterline falls at constant rate then slows as it approaches the opening. The spec wants outflow to weaken as level approaches the opening — this matches.

But then the initial fall rate is constant, and total drain time = (depth-remaining)/rate. Let's compute: v = 0.42*sqrt(2*1500*86) = 0.42*sqrt(258000)=0.42*508=213 px/s. flux = 213*86 = 18300 px²/s → level drop = 18300/470 = 39 px/s. Water depth initial = tankB - waterY0 = 660-210=450? Let's see tankB = floorY-52 = 722-52=670, waterY0= tankT + (tankB-tankT)*0.2 = 92+ (670-92)*0.2=92+115=207. So depth = 463 px. It drains to o.bot=430+43=473 level → remaining depth 670-473=197. So drop of 266 px at 39 px/s → ~7 s of draining, then the remaining 197px stays. That's fast-ish but okay. Maybe slow it down a bit for nicer visuals: use coefficient 0.30 and cap head. Let me use v = 0.35*sqrt(2*G*head) → 169 px/s → flux 14500 → 31 px/s → ~8.6s. Fine.

Also the jet particle spawn rate: rate = flux*0.030 = 435/s — too many. Let's compute: I want maybe 120 particles/s. rate = flux*0.008 → 116/s. And particles live ~1.5s → ~175 particles on screen. OK, but each particle drawn as 2 strokes. Fine, maybe 0.006.

Let's also make the jet speed equal the exit velocity so the curve is consistent.

Additionally, jet particles spawn at x = tankL - random*26 (outside) → they're born outside the glass; they'd better spawn inside the tank and cross. Let me spawn at x = tankL + random*20 (inside) with vx = -v (outward) so they accelerate out and the stream emerges from the hole. But inside the tank they should follow the suction field, not straight. Simple: spawn inside with velocity toward the opening center: direction from spawn point to opening, speed v*0.6; when the particle crosses the glass plane, convert to jet velocity (dir*v, small vy). Let's implement: particle has mode 'in' or 'out'. For 'in': steer toward opening center at speed v*0.7, plus gravity small. When x crosses plane (x < tankL for left), set mode 'out', vx = -v, vy = small, then gravity curves it.

That gives a nice converging funnel.

Let me rewrite updateJet accordingly.

Also the current field: currentAt gives suction toward opening with magnitude flowMag*falloff. flowMag = min(260, 40+flux*0.010) → with flux 14500 → 185. OK.

Fish fight: c.m near opening could be ~185 → eff = min(1,c.m/60)*fatigue = 1 → fish swim away strongly. Good.

Also checkExit: b.r*2 < h*0.82 → 86*0.82=70 → rocks r=16..30 (32-60 diameter) would fit! I wanted rocks not to fit. Rocks have r up to 30 → 60 < 70 → they'd be swept out. That's OK-ish ("movable objects that fit the opening can be carried out"), but rocks resting on the bottom far away won't reach. Fine — the pebble definitely can. But large rocks might get sucked out through the hole which looks odd but is acceptable per spec. Actually rocks are on the tank bottom, the opening is mid-height, so suction may pull them. Fine.

Also I need objects to be pulled to the opening: currentAt falloff 1/(d/95) with d = dist+26. At 200px away → 1/(226/95)=0.42 → m = 185*0.42=78 px/s suction. Combined with rock drag, the rock will move toward the hole slowly. Good.

5. Water level fall needs to be visible; also the jet should push the water surface — fine.

Let me now also fix the opening rendering and weed.

Also: checkExit uses o from openingRect() which grows; fine.

One more: the crack handle position for right side: tankR+18 — nearSide checks |x-tankR|<34 so grabbing handle works.

Let me implement fixes.

Now fix opening rendering (dark box outside), weed position, and swirls.

drawOpening rewrite: jagged edges on the glass line + a subtle dark slot inside the tank.

Also the swirls: reduce alpha and place them inside the tank near the opening.

Let me rewrite drawOpening.

Also the swirls are drawn centered at o.x + dir*rr*0.5 where dir is outward... in drawWater I used `S.side==='left'?1:-1` for inward offset: sx = o.x + (S.side==='left'?1:-1)*(rr*0.5+sin*10) → inward for left = +1 ✓.

Now reload and test the breach, then sample the outflow. I'll add a JS evaluation? The browser tool doesn't have an eval action. I can only inspect DOM telemetry, which gives me flux/jet speed/water level. Good enough.

Reload, drag crack, click breach, wait (screenshots advance time?). The tool's screenshot says "Frame 1, +0ms" — unclear if time advances between calls. Let's take several screenshots in sequence and see if the level falls. There may be a delay between calls (a few hundred ms). Let me test by taking repeatedscreenshots.

Rocks now sinking (they're mid-water falling). Weed is now at ~y=525 (inside water, fine).

Now drag crack to a lower position (e.g., y=470) and click Breach, then observe over time.

Note: the plants bend — one plant already leans left (the current is 0 though; bend target 0 with sine sway). Looks fine.

Let's drag to y=470and breach.

Now outflow = 1215-3401 px²/s, jet speed 325 px/s. But I don't see the jet particles! The opening region shows white debris triangles at x≈355, y 400-520 — those are the glass fragments (still). Where's the jet? Particles spawn inside the tank near the hole; they should converge and shoot out. Maybe they're there but faint. Also the water level hasn't fallen yet in this frame (still 100%, but the level text updates each frame — the screenshot shows 100% while outflow 1215; the level changes slowly: 1215/470 = 2.6 px/s → slow!).

Hmm: flux = v*area. area = o.h = 86 (fully submerged), v=325 → flux should be 28,000. But it shows 1215. Because S.grow ramps: flux multiplied by min(1, grow*1.6) — grow starts 0 so flux small. In this frame grow is small. OK.

Wait also `head = o.bot - level` = 473-207=266 → v = 0.36*sqrt(2*1500*266)=0.36*893=321 ✓ matches 325.

So flux = 325*86*grow*1.6. Once grow=1, flux = 28,000 px²/s → level drop = 28000/470 = 60 px/s. That's very fast (463px depth drains in ~8s). Too fast? The jet particles spawn rate = flux*0.0075 = 210/s, capped at 10 per frame → at 60fps that's 600/s so no cap issue. 210 particles/s * ~2s life = 420 particles. Might be heavy but ok.

But the visual: the jet isn't visible. The particles inside the tank should be visible as streaks. In the screenshot I see no streaks. Because in 'in' mode the particle is in the water and the drawJet draws streaks for all particles — should be visible. Maybe only a few exist yet (grow small → flux small → few spawns).

Let me wait and take another screenshot to see the developed state. Time between calls is probably ~1s. Let's take a couple screenshots.

Also note jet speed 325 px/s with gravity 1500 → the jet will arc noticeably. Good.

Also the "escaped" count is 0 and the current swirls appear faintly.

Let me screenshot again.

Excellent! The jet is now visible and clearly curves downward. The waterline has fallen to 50%. Escaped: 4 objects (fish escaped, weed escaped — the green star is outside the tank at top-left... wait the weed is at (380,380) which is inside the tank? The waterline is at 440 now, so the weed at 380 is above the water, outside the water — it floated up. Fine.

Errors: "Cannot read properties of undefined (reading 'forEach')" — in drawEscaped: `for(const b of S.rocks.concat(S.props)) if(b.out) drawRock(b);` — drawRock is fine. Where's forEach? S.water is a Float64Array. Hmm, "reading 'forEach'" — maybe in updatePuddle? No forEach. Search: I use for...of loops. Let me grep for forEach.

Also note escaped fish are drawn outside but the fish at (800,398) is inside the tank region? It's at x=800 which is inside the tank (tankR=835). Hmm, the fish drawn at (800,398) is above the waterline (440) → it's floating in air inside the tank? That's the escaped fish drawn on top of the tank (drawEscaped draws after everything). It's an escaped fish that flew up? Escaped fish get vy=-30 → they rise? No: vy positive is down; -30 is up. Then gravity brings it down. It would land on the floor. But this one is drawn at 800,398 mid-air. It probably was swept out of the left opening but drawn... no, its x is 800.

Wait — maybe it's a fish that got "out" while still inside the tank region? checkExit sets b.out=true when it passes the plane at the opening. The fish then moves with gravity and floor collision at L.floorY. It can't be at (800,398).

Unless... the escaped fish is one that was carried by the current to the right wall and stayed inside; the drawing order puts it over the tank. Actually look: it's a fish at (800,398) and it's above the water. Could it be a fish that escaped (out=true) but its position is still inside the tank since checkExit triggered when crossing the plane... plane is the left wall. Hmm.

Oh! Bug: in checkExit I check `b.r*2 < h*0.82` and the through test, but I never verified the object is on the correct side of the tank. For dir<0 (left opening): through = b.x - b.r <= o.x + 4 → true for any object near the left wall. Fine.

But wait: for the RIGHT side case dir>0: through = b.x + b.r >= o.x - 4 where o.x = tankR. An object at the right wall. Fine.

So how is a fish at x=800 marked out? Maybe it was swept to the right wall (current from the left opening pulls left, so no)... Actually the current field pulls everything toward the opening on the left. Fish get pushed left. Hmm.

Alternatively, the fish was pushed outside the left wall, marked out, then... it's drawn at 800? No.

Let me reconsider: maybe the fish at (800,398) is a normal in-tank fish (not out) — it's drawn in the normal loop too. It appears above the waterline (440) because fish are clamped to y > levelY+6+r only when not breached; after breach the clamp is disabled so fish can swim above the water line! Yes: `if(f.y-f.r < S.levelY+6 && S.breached===false)`. So after breach fish swim into the air region. Fix: always clamp fish below the water surface (they can't leave the water except through the breach). Clamp to levelY + r + 2.

Also the escaped count 4 includes fish + weed; good — objects ARE being carried out.

Now the error. Let me grep for forEach in the file.

Also puddle is 0 — the jet reaches the floor at the left (particles land at x~250, y~700) but deposit() isn't happening: deposit(x, 120*dt) → 120*0.016 = 2 per particle. Total influx = flux 12742 px²/s should correspond to level drop 27 px/s * 470 width = 12,700 px²/s ✓. The puddle should receive that volume. deposit adds 120*dt per particle → with 95 particles/s → 11,400 px²/s ✓ should show. But Puddle: 0. So deposit isn't working → colIndex? L.px0=34, x≈250 → i = (250-34)/4.9 = 44 ✓ in range. Hmm, but updatePuddle then diffuses... total should remain. But HUD shows 0.

Wait — maybe the jet particles never reach the floor: they hit the floor condition `p.y >= L.floorY - ph`. L.floorY = H-78 = 722. The jet particles in the screenshot do reach the bottom around y=700. So deposit should be called... unless the screenshot was taken before they landed.

But telemetry says Puddle 0 px² while the jet visibly hits the floor at the left. Hmm, but maybe the puddle did form and the value updates each frame. Let me look: there's a small dark area at bottom-left, no visible puddle.

Possible bug: updatePuddle creates `const d = new Float64Array(S.np)` — fine. Then `S.water[i]=Math.max(0,S.water[i]+d[i])`.

deposit(): S.water[i]+=amount ✓.

Unless L.np is 240 but S.water length... allocated in reset ✓.

Hmm, but `colIndex` uses L.colW = (L.px1-L.px0)/L.np = (1166-34)/240 = 4.7 ✓.

Maybe the issue: particles land but deposit is called with amount 120*dt... that's fine.

Oh wait! In updateJet, the landing check happens for mode 'out' particles. But the screenshot shows the jet reaching the floor — but maybe those particles' y is still above floorY=722 while visually near the bottom (the image is 800 tall; the jet ends at ~700). Actually L.floorY=722 and the visible jet ends around y=700-710. So they haven't hit yet. OK, plausible.

But then why is the error thrown? If an exception is thrown in the frame loop, requestAnimationFrame(frame) would not be re-scheduled → the animation would freeze! But the level kept falling between screenshots (100% → 50%), so the loop continues. The error appears in console — maybe it's thrown but caught? No. If an exception happened inside update(), then frame() would break before requestAnimationFrame(frame) → animation stops. Since it continued, the error must come from... maybe it happened once in a place where I re-schedule? No, requestAnimationFrame(frame) is at the end of frame(). Unless the error occurred inside an event handler (pointermove → updateHud?). updateHud uses for loops.

Where's forEach? Let me grep.

Actually `S.legCols.forEach`? No, I use for loops. Let me grep the file.

Also possible: `el('...')` returns null → "Cannot read properties of null". The error says "reading 'forEach'". Hmm — maybe it's from the browser's own code? Let's grep.

Line 705: `b.shape.forEach` — for the toy/weed props drawn with drawRock? No, drawRock is used for rocks which have shape. But in drawEscaped: `for(const b of S.rocks.concat(S.props)) if(b.out) drawRock(b);` — props (toy, weed) have no `shape` → drawRock on a prop → b.shape undefined → error! That's the bug. Fix: in drawEscaped, draw props with their own draw functions.

Let me restructure escaped drawing:
- escaped props: toy → drawToy, weed → drawWeed.
- escaped rocks → drawRock.
- escaped fish → drawFish.

Also fix fish clamping above water and other issues.

Also, escaped objects fall to the floor; the escaped weed at (380,380)?? The green star at (380,380) is drawn inside the tank — it's the weed marked out (escaped) but still at that position. Its position is inside the tank. Hmm, escaped objects get vx = dir*max(70, jetV*0.85) = -70*... dir=-1 → vx=-70 → moves left out. But the drawn weed is at x=380, inside the tank (tankL=365). So it moved slightly left and is falling. OK, it's mid-flight. Fine.

Wait, but escaped weed shouldn't be inside the water region visually drawn over water. It's fine.

Now the fish clamp fix, and also ensure fish don't escape upward.

Also: rocks that get swept out — they're drawn via drawRock ✓.

Let me also reconsider the checkExit for props: for the toy (r=17 → 34 < 70 ✓ fits), weed (r=16 ✓).

Next: the fish above the water — clamp always.

Additionally, I want the toy to be carried out; it's near the surface, and the current pulls it toward the opening (mid-height) — the toy's spring holds it at the surface; the current pushes it left toward the opening x but the opening is at y=470 (below the surface). The toy can't reach the opening since it's pinned to the surface. Hmm — the toy would only leave if the water level falls to the opening. That's realistic: the toy floats and gets carried out when the water level drops near the hole. But also the current could drag it toward the wall and hold it against the glass near the opening.

To make the toy escapable, let's have the current pull it down toward the opening a bit when the flow is strong (the jet's suction can pull a floating toy down and out). I'll relax the toy's surface spring when the current is strong: targetY = levelY-15 but allow the current's vy to drag it: increase the spring's compliance with current magnitude. Simpler: give the toy a "stuck" surface behavior with weak spring (k=14) so strong suction (cy up to 200) can pull it down. The spring force = (targetY-y)*14; suction vy contribution: b.vy += c.y*1.4*dt — c.y is toward the opening, so downward if the opening is below. With c.m up to ~200 and the spring k=14, the equilibrium offset = c.m*1.4/14 = 20px. Not enough to reach the hole from the surface (250px above). Realistic though.

Better approach: when the water level falls to the opening, the toy is at the surface near the hole and gets carried out. That'll happen near the end of the drain. Good enough — plus "movable objects that fit the opening can be carried out by the flow" is satisfied by the pebble, fish, weed.

Let's ensure the pebble (r=11) gets carried out: it's on the tank bottom; the suction must lift it. The rock's net accel is G*(2.4-1)=2100 down; drag 5*... The suction current c.x max ~200 px/s, and drag pulls the velocity toward c.x*1.7 → up to 340 px/s but gravity keeps it down. Terminal: drag force = 5*(c.x*1.7 - vx) = gravity 2100 → vx ≈ c.x*1.7 - 420. With c.x=200 → vx = -80 (toward the opening) — so it can slide along the bottom toward the wall. But it must also rise to the hole's height (y=470) which is above the bottom (655). It won't rise. So the pebble stays. Hmm.

To let objects be carried out, the flow should lift them: add a vertical component of suction toward the hole center (already: c.y). The rock's drag pulls vy toward c.y*1.7. For the pebble to rise, c.y*1.7 must exceed the gravitational term → c.y > 2100/5 = 420 → too high.

I could reduce the density effect for small objects or add "entrainment": the flow drags objects with a stronger coupling than pure drag: e.g., apply flow drag as vx += (c.x - vx)*k*dt with k=5, and the effective gravity reduced when in a strong current (turbulence). Alternatively increase flowMag near the hole: flowMag up to 280 and falloff 1/(d/95) → at d=60 → 1.6 → m = 280*1.6=450 near the hole. Then c.y*1.7 = 765 > 420 → the pebble near the hole would be lifted. Good — near the hole the current is strong.

Also the opening height is 86px, so an object at the bottom (655) is 185px below the hole (470) → d = 185+26=211 → falloff = 1/(211/95)=0.45 → m=126 → c.y*1.7=214 < 420 → not lifted. So the pebble on the floor stays. That's physically sensible (heavy objects don't get lifted by a small hole).

But then "Movable objects that fit the opening can be carried out by the flow" is satisfied by fish/weed/toy? The weed floats (buoyant) and can be pulled to the hole... it's also held near the surface.

Hmm. To make the pebble come out (nice demo), I could make the pebble low density (light stone, e.g., a shell with dens 1.15) so it can be lifted by the current. Let's make the pebble dens 1.1 and give it a small upward bias: then net gravity = 150 px/s² down; drag pulls toward current → it can be lifted by the flow toward the hole. Set the pebble dens=1.05 → net 75 down → easily lifted by suction.

Also to help: apply flow coupling more strongly to light objects.

Also the toy: let's make the toy's surface spring weaker (k=8) and allow the suction to pull it down when the flow is strong; the toy has no gravity term, so it will follow the suction. Actually the toy's vy is driven by the spring toward the surface; the suction adds cy*1.4. With k=8 the equilibrium offset = c.y*1.4/8. At m=126 → 22px. Not enough. But when the water level descends to the hole height, the toy is right there and gets sucked out. That'll happen. Good.

Now also "fish initially swim against the current before some are swept through the breach" ✓ (fight then fatigue).

Let me now make the fixes:
1. drawEscaped: use the correct draw function per type.
2. Fish clamped below the water surface always (and they can't leave the water except through the breach).
3. Pebble density 1.05 (light shell) so it can be carried out.
4. Maybe increase flowMag slightly.

Also the puddle: check after fixing.

Another thing: the jet currently exits horizontally and curves down — visible in the screenshot ✓ nice.

Also debris: the glass fragments fly out ✓ and land on the floor (small triangles at bottom-left) ✓.

Let me implement thefixes.

Also: escaped props (toy/weed) need gravity + floor collision. Currently the props loop only handles them while !out? Let's check: in updateObjects, the loop over bodies: for the toy branch, `if(b.type==='toy' && b.float && !b.out)` → when out, it falls through to the rock branch, which applies buoy = G*(dens-1) → for the toy dens 0.55 → upward force of 675 → the toy would float upward! Bad. Need an escaped branch for props: gravity-driven, floor collision.

Let me add at the top of the body loop: if(b.out) { gravity, air drag, floor/wall collision, angle } and continue.

For rocks, the escaped case also needs gravity and floor collision — currently the rock branch applies buoyancy even when out (rocks out would sink: dens 2.4 → positive → down ✓, but the drag branch: submerged false → vx*=..., vy*=... ok, and the tank floor check `inTank` false so no floor collision → they fall through to L.floorY? There's no floor collision for rocks outside. Need to add.

So add a generic escaped-body branch.

Also the toy out should land on the floor.

Let me restructure the body loop: at the start, `if(b.out){ ...physics...; continue; }`.

Escaped body physics:
b.vy += G*dt; b.vx*=(1-0.4dt); b.vy*=(1-0.2dt);
b.x+=vx*dt; b.y+=vy*dt;
b.ang += b.spin*dt (rock) — for toy use tilt.
floor: if(b.y + b.r > L.floorY){ b.y = L.floorY-b.r; b.vy = -b.vy*0.3; b.vx*=0.6; }
walls: clamp x within [L.px0+r, L.px1-r].

Also, escaped objects should be able to rest on the tank stand top? Ignore.

Let me write this.

Also the toy's spin: toy.ang tilt.

Another improvement: the toy while in the tank — when the water level falls below the toy's position, it should... fine.

Let me applythe edit.

Good, no console errors. Rocks are sinking (still falling at frame 1).

Now let's run the breach and observe over time. I'll drag the crack to the lower position, click Breach, then take screenshots at intervals to check: jet curve, waterline fall, current response, puddle formation, escaped objects, and finally Reset.

Let's drag crack to y=470and breach.

Rocks settled at the bottom. The pebble (small) is at (628,470) floating mid-water — it's light (dens 1.06) so it's neutrally buoyant and doesn't sink. Hmm, a light pebble should sink slowly to the bottom (dens slightly > 1 → net down 90 px/s², drag 5 → terminal 18 px/s) — it is falling slowly. OK.

The weed clump is above the water (at 445,175) — it's floating at the surface but drawn above the waterline? The waterline is at 207 and the weed is at 175. Target = levelY-22 = 185. It's drawn at 175. Fine, but visually it's above the water surface line. Let's make the weed target levelY-10 so it sits at the surface.

Actually the weed drawn at y=175 with radius 16 spans 159-191, above the surface 207 → it looks like it's in the air. Fix: target = S.levelY - 8.

Also the toy is at the surface ✓.

Now let'sbreach and watch.

Breach started: glass fragments flying on the left, the opening is forming. But I notice the opening is at y≈470 (crack at 388+92=480) ✓.

Now let's wait for the jet to develop. Take screenshots.

Big problem: the water level dropped very fast (37% already) and the jet is now a thin trickle. The level fell below the opening quickly (opening at 480, level now at ~500 → below the hole, so outflow nearly stopped). But the drain rate was too fast: it drained 63% in ~1-2 seconds.

Wait: at level 37% → levelY = 670-0.37*463 = 499. The opening bottom = 480+43 = 523. So the level (499) is above the opening bottom (523)? No: levelY=499 < 523 means the surface is above the bottom of the hole → still flowing. Yes, "head = o.bot - level" = 523-499=24 → v = 0.36*sqrt(2*1500*24)= 0.36*268=96 ✓ matches jet speed 96.

But it dropped 63% of 463 = 292px in ~1.5s → 195 px/s average. That's way faster than my computed 60 px/s. Hmm, because head was large initially: head = 523-207=316 → v=0.36*sqrt(2*1500*316)=0.36*973=350 → flux=350*86=30,000 → level drop = 30000/470 = 64 px/s. To fall 292px at 64 px/s takes ~5s. So ~5 seconds elapsed between the click and this screenshot. Plausible (each tool call takes seconds).

So the drain is ~5 s from full to the hole level. That's quite fast but acceptable? The spec wants the waterline to fall continuously and outflow to weaken. It works but the visible drainage is quick. I'd slow it down so users can observe: reduce the coefficient 0.36 → 0.22 and reduce the effective area factor? Let's make the drain ~12-15 s total. Level drop rate = flux/tankW = v*86/470. For 15s to drain 290px → avg 19 px/s → flux avg 9000 → v avg 105 → with head avg ~150 → coefficient c: v = c*sqrt(2*1500*150)=c*671 → c=0.156. Let's use c=0.16. Then initial v = 0.16*sqrt(2*1500*316)=0.16*973=156 px/s, initial flux=13,400 → 28 px/s → draining 290px takes ~12s with slowing. Good. And the jet speed 156 px/s is still a decent jet; gravity curves it over 480px.

Hmm, but a slower jet also means the arc is less dramatic. It's fine — gravity 1500 gives a curve: with vx=156, time to fall 250px = sqrt(2*250/1500)=0.58s → x travel = 90px. Nice arc.

Also the outflow should weaken as the level approaches the opening ✓ (head shrinks).

Second problem: Escaped: 7 objects — ALL the fish plus the toy plus the pebble got swept out, and they're piled at the bottom-left. The toy is out too (the duck at the bottom left). That's aggressive: the spec wants "fish initially swim against the current before some are swept through the breach" — some, not all. Currently all 6 fish escaped. That's because the current field is strong and the fight fatigue decreases after 11 s; but also the suction pulls them to the hole regardless.

I need to tune: the current shouldn't suck everything in so strongly. Reduce flowMag, and make the fish's resistance stronger: the fish should be able to hold position against the current for a while, and only fish close to the opening get swept out.

Ideas:
- Make currentAt falloff sharper: 1/(d/95) → use 1/(d/70)^1.5 or a max radius. Let's use falloff = 95/ (d+30) but cap the influence radius: if d > 260 → 0. So only fish within ~260px of the hole feel it.
- Reduce flowMag: min(160, 20+flux*0.006).
- Fish fight: give the fish a strong "hold" behavior: they swim against the current with the full speed and their drag limits how fast the current drags them. Currently the fish velocity is lerped toward the desired swim velocity with k=2.6, and then the current adds c.x*1.5*dt to the velocity — this additive term dominates. Better: treat the current as a fluid velocity that drags the fish: f.vx += (c.x - f.vx)*kFluid*dt with kFluid ~1.2, so a fish swimming against a strong current still moves at its own speed minus some slip. Then when fatigue sets in, kFluid rises (the fish tires and gets swept).

Let me implement: 
kFluid = 0.8 + 2.2*(1-fatigue) → when fresh, the fish largely holds its own (swim velocity dominates), when tired, the current dominates → swept out.

Also the desired swim velocity should be toward safety (away from the hole) when the current is significant.

Also "some are swept through the breach" — with a radius limit, the fish far away won't come. But if they get tired, the ones near the hole get swept.

Additionally, the toy's escape: it got carried out quickly because the current pulls it (b.vx += c.x*1.4*dt, additive). Same fix: use drag toward the fluid velocity for the toy and the weed, so they aren't instantly yanked. But then nothing would be carried out except by suction when close to the hole. That's fine: the toy floats near the surface; the hole is at mid-height; the toy will be dragged toward the wall and hover near the hole only when the level drops. When the water level reaches the hole height, the toy is right there and gets swept out ✓.

The weed: floats near the surface too; it should drift toward the opening region. Its drag-based coupling will bring it slowly toward the hole horizontally (the horizontal suction component). It can't rise to the hole's height though (it's pinned to the surface). When the level drops to the hole, it escapes ✓.

The pebble: at the bottom; the suction's vertical component can lift it if strong enough. With drag-based coupling, the pebble's velocity → fluid velocity (c) blended with gravity. Let's see: pebble dens 1.06 → net accel 90 down. Drag k=5: terminal v = 90/5 = 18 px/s down relative to fluid. So it gets carried by the fluid with a slight sink ✓ → it can be swept toward the hole and even lifted by the upward component of the suction near the hole (since the fluid velocity there has an upward component toward the hole center). The pebble sits on the bottom; the fluid velocity near the bottom points toward the hole (up-left) → the pebble moves up-left ✓. So it can be carried out.

But heavy rocks (dens 2.4) → net accel 2100 → terminal 420 down → they stay on the bottom ✓ (they may slide slightly). Good.

So: change the rock/prop coupling to a drag toward the fluid velocity with a modest coefficient, and for the toy/weed add the same.

Currently for rocks I have: b.vx += (c.x*1.7 - b.vx)*5.0*dt — that IS a drag toward c.x*1.7 with k=5 ✓ (already drag-based). Good — so the pebbles' behavior is already drag-based. The fish and toy/weed are additive. Let me convert the fish and the toy/weed to drag-based too.

Toy: b.vx += (c.x*1.4 - b.vx)*2.2*dt → drag-based already (there's `b.vx += (c.x*1.4 - b.vx)*2.2*dt;` in the toy branch). Yes it is drag-based. But then the toy got carried out... The toy's equilibrium x velocity = c.x*1.4 → if c.x = 150 → 210 px/s toward the hole. Then the toy races to the wall and then... it's pinned to the surface (spring), so it can't pass through the hole at mid-height → checkExit requires the toy's y within the opening range. The toy at the surface (y=207) vs the opening [437,523] → not in range → it stays. But it WAS counted as escaped (7 escaped: 6 fish + toy + pebble = 8? It says 7). Hmm, maybe the toy is the yellow duck at the bottom-left ✓ (I see a yellow duck at the bottom left). So the toy escaped: it must have been within the opening's y range at some point (when the water level dropped to the hole height, the toy at the surface was at the hole's level → swept out ✓ — that's exactly the intended behavior!). Great, that's physical: as the water drains, the toy descends with the surface to the hole and gets carried out. 

So 7 escaped = 6 fish + toy (pebble not yet). The fish all escaped — too many. Need to limit fish escape.

Fix fish: use drag-based coupling with a fatigue-dependent coefficient and limit the current's reach.

Let me also reduce flowMag so the near-hole current isn't overwhelming: flowMag = min(200, 25 + flux*0.008).

With flux = 13,400 (after slowing) → flowMag = 132. Near the hole (d=60): falloff = 95/(60+30)=1.06 → m=140. Hmm the current magnitude near the hole ~140 px/s. Fish swimming at 50 px/s can't beat that → they'd be swept once they get close. But with the drag-based model, the fish's velocity relaxes toward the desired swim velocity with k=2.6 (strong) and the fluid drag adds. Let me restructure the fish:

desired velocity dv (swim, includes anti-current steering)
f.vx += (dv.x - f.vx)*3.0*dt          // swimming propulsion dominates
f.vx += (c.x*0.8 - f.vx)*kFluid*dt     // current drag (kFluid small when fresh, big when tired)

With kFluid fresh = 0.5: the fluid drag pulls the fish toward c.x*0.8 = 112 at rate 0.5/s, while the propulsion pulls toward dv at 3/s. Steady state: v = (3*dv + 0.5*0.8c)/(3.5) → with dv=-60 (swimming away) and c=140: v = (-180+56)/3.5 = -35 → the fish moves away from the hole at 35 px/s ✓ resists. When tired (kFluid=3): v = (3*(-60)+3*112)/6 = (-180+336)/6 = +26 → carried toward the hole ✓.

Good. Let's implement kFluid = 0.5 + 2.5*(1-fatigue).

Also the anti-current steering: away from the hole with magnitude eff*spd — keep, but with fatigue decay so eventually they stop fighting and get swept. But the fluid drag with a big kFluid already sweeps them regardless of steering. The steering should also weaken.

Also limit the current's reach radius to ~300px so distant fish are unaffected initially. Actually the initial falloff 95/(d+30): at d=300 → 0.29 → m = 40 — mild. That's fine; keep it.

Third problem: the puddle is 0 and no puddle is visible. The jet reached the floor (I see streaks at x≈320, y 560-630 — they end at ~630, not reaching the floor at 722). Because the jet speed is now low and the particles' life expires (life 1.6-3.0s) before reaching the floor! The particles die mid-air. That's why no puddle forms. Fix: increase the particle life (or remove the life limit for 'out' mode particles — they should fall to the floor). Set the 'out' life to 6s and remove the fade. Let me set life for 'out' mode: don't decrement; only remove on floor hit or out of bounds. But then particles that miss... they'll always hit the floor since gravity. OK: for 'out' mode, ignore life (except a hard cap of 8s).

Also the jet particle 'in' mode: life 1.6-3.0 might expire before reaching the hole if the path is long; increase to 3s.

Fourth: the water surface after draining is at 499 and there's still a "current swirl" white ellipse artifact near (390,500) — the swirls are drawn as ellipses in the water clip; they look like white loops. Reduce further or remove. I'll keep them subtle (alpha .12) and make them smaller.

Fifth: the tank's water is now only in the bottom third and the glass fragments fell. Looks good.

Sixth: the glass fragments on the floor: I see 2-3 white shards near the tank's left bottom ✓.

Also I notice the escaped objects pile at the bottom-left corner of the room, outside the left wall at x=34 (the room wall). They pile up against the wall ✓ (constrained by room walls).

Now, the puddle: after the fix, water will land on the floor around x≈300 and spread.

Also, note the water that landed should be visible as a puddle. Let's verify after fixes.

Another thing: the tank's water region above the level (the empty upper part) shows the room background — fine.

Let me also double check the "escaped" objects don't get counted when the water is low.

Also the fish that escape: they swim out through the hole. Visually they get "out" when crossing the plane ✓.

Let me now apply the changes:
1. Jet speed coefficient 0.36 → 0.16.
2. Fish fluid drag model.
3. flowMag tuning: min(220, 25+flux*0.008).
4. Jet particle life fix.
5. Weed target y = levelY-8.
6. Swirls subtler.

Also since the drain is slower, more time to observe.

Let me edit.

Also the toy: `b.vx += (c.x*1.4 - b.vx)*2.2*dt;` — with flowMag now smaller, the toy moves toward the hole at c.x*1.4 speed. Let's make it drag-based with the fluid velocity (c.x) and a smaller factor: b.vx += (c.x*0.9 - b.vx)*2.0*dt. And remove the extra `b.vx += dir*c.m*0.9*dt` line in the toy branch (the additive push). Let me look at the toy branch code:

```
if(b.type==='toy' && b.float && !b.out){
  const targetY = S.levelY - 15 - Math.sin(S.t*2+b.phase)*2.2;
  b.vy += (targetY - b.y)*14*dt;
  b.vy *= (1-4*dt);
  b.vx += (c.x*1.4 - b.vx)*2.2*dt;
  b.vx *= (1-1.2*dt);
  if(S.breached && c.m>4){
    b.vx += dir*c.m*0.9*dt;
    b.vx += -b.vx*0.6*dt*0; // keep
  }
  b.x += b.vx*dt; b.y += b.vy*dt;
```
The extra push `b.vx += dir*c.m*0.9*dt` is additive and strong → remove it. Keep drag-based.

Also the weed: `b.vx += (c.x*1.5 - b.vx)*1.1*dt;` → make it (c.x*0.9 - b.vx)*1.6*dt.

Let me edit those.

Also the toy/weed's vy spring keeps them at the surface. When the level drops to the hole, they get swept ✓.

Also there's a subtlety: the toy near the hole gets pulled down by c.y? The toy's vy is spring-dominated: b.vy += (targetY-b.y)*14*dt — a strong spring; the current's vy isn't applied to the toy at all. So the toy stays on the surface and won't be pulled down. When the level drops to the hole's height, the toy is at the surface = the hole's level ✓ swept out.

OK. Also for the weed, add a bit of the current's vertical influence so it can be dragged down a bit near the hole: b.vy += c.y*0.35*dt. Let me add that to the weed.

Let me apply.

Time is short. Let me apply the essential edits quickly (the toy/weed current coupling), then verify once and finish.

Intact scene looks good (rocks still falling in this first frame). Now breach and sample. Drag crack lower (to ~480) then Breach, then screenshot.

I have limited time (~5 min). Let me do: drag, click breach, screenshot.

The breach happened: fragments falling on the left, outflow 66 px²/s (growing), jet speed 157 px/s. Now let's sample the early outflow — screenshot after a couple of seconds.

Good: the waterline fell to 40%, the jet is a thin trickle curving down-left, 2 objects escaped (a fish and a rock), a puddle is starting to form at the bottom-left (small blue at x≈330, y 715). The jet falls and hits the floor.

But: the water level dropped from 100% to 40% quite fast again (in maybe 4-6 s). It's acceptable — visible falling and weakening outflow.

One issue: the water level (490) is now ABOVE the hole? The hole is at crackY=490 (398+92). The water surface is at ~490. The jet is still flowing weakly ✓.

Another observation: the water surface is drawn at the top of the remaining water but the water region below the hole... fine.

Issue: the puddle is small but present. It should spread. Let's check in a moment.

Another: the fish at the surface got swept out (2 escaped: one fish at the hole, one rock at the bottom-left corner). The rock at the bottom left (390,625) is inside the tank bottom-left — that's an escaped rock? It looks like it's outside the tank's left wall at x=390? The tank left wall is at x=365. The rock at 390 is inside the tank. Hmm, it's a rock that moved left and is at the wall — fine.

Also there's a white fragment streak at the left going down (a glass shard falling outside) ✓.

Let me now check the puddle spread and then test Reset. Time is short: take one more screenshot after some seconds to see the puddle, then click Reset.

Actually more important: verify the puddle spreads and that Reset restores. Let me do the screenshot then reset.

Water at 34%, outflow weakening (912 → 908), jet speed 43 px/s. An escaped fish lies on the floor at the bottom-left ✓ (it fell out and landed).

Puddle shows 0 px² in telemetry but there's a visible small puddle spot at the bottom-left earlier. Now the puddle telemetry shows 0 — the puddle was dissipated? updatePuddle diffusion could push it out of bounds? No. Hmm, "Puddle: 0" but the level shows 34%. The jet is barely flowing now so little deposit.

But earlier the puddle showed 0 too even with visible water. Let me check the deposit: `deposit(p.x, 120*dt)` — dt≈0.016 → 1.9 per landing particle. The landing rate: the jet spawn rate = flux*0.0075 = 900*0.0075 = 6.7/s → deposits 13 px²/s. Tiny compared to the 900 px²/s flux! That's why the puddle is negligible.

The deposit should equal the flux: each jet particle represents a volume = flux/spawnRate per particle. flux 900, spawnRate 6.7 → each particle carries 134 px². So deposit should be ~134 per landing particle, not 120*dt.

Fix: deposit(p.x, perParticle) where perParticle = S.flux / rate = 1/0.0075 = 133. So deposit(p.x, 133) at landing. But then the number of particles per second varies with the flux while the volume per particle is constant → the puddle volume rate = spawnRate*133 = flux ✓ correct.

So change `deposit(p.x, 120*dt)` → `deposit(p.x, 1/0.0075)` i.e. 133. Let me use a constant JET_VOL = 130 and set the spawn rate = flux/JET_VOL.

Let me implement: const JET_VOL = 130; rate = S.flux/JET_VOL; deposit(p.x, JET_VOL).

With flux 900 → 6.9 particles/s; flux 13,000 → 100/s. Good.

Also the earlier puddle rendering: the puddle height = water[col]/colW where colW=4.7 → a deposit of 130 into one column → height 27px. That's a big spike but the diffusion smooths it.

Let's apply this fix and also check that the puddle renders (drawPuddle requires total>0 ✓).

Quick edit then verify: reset → breach → wait → check puddle > 0.

Time: ~3 min left. Let me be quick.

Also, the water that exits should be conserved: the level drop uses flux/tankW ✓ and the puddle receives flux ✓.

But note the puddle is capped by the room floor width and the deposit x may be outside [px0,px1] — the jet lands at x≈300 which is within ✓.

Now quickly verify: reload, breach, screenshot, check puddle. Then test Reset.

Note the diffusion coefficient: k = min(0.45, dt*4.2) ≈ 0.067 per frame; transfer = (hi-hj)*k*colW*0.5 → spreads over time ✓.

Let's test.

Intact scene ✓ (rocks falling to the bottom in this first frame, weed floating near the surface ✓, toy floating ✓).

Now breach and check the puddle. Click Breach directly (crack at default 328 world y).

Then take screenshots. ~2.5 min left. Let me be efficient: click breach, then screenshot twice, then clickReset and screenshot.

Breach at the default crack position (left, y≈328 world). Glass fragments flying out ✓. Fish are being pulled toward the hole (two fish near the left wall) ✓.

Now check the puddle after some seconds. Screenshot.

The jet is clearly visible and curves downward ✓ (a long curved stream down the left). Water level 84% and falling ✓. Escaped 2 objects (a fish at the hole and the pebble near the hole). Glass fragments on the floor ✓.

But Puddle: 0 still! And the jet stream visually reaches down to the floor at x≈320,y≈700... Actually the jet stream ends around y=610 (the white streak) — the particles are dying? life decremented at dt*0.4 → 2.5-3.75s of life, and the fall from y=300 to 720 takes sqrt(2*420/1500)=0.75s. So they should land.

Hmm, but the puddle shows 0. Wait — the visible white streak near the bottom (x=320, y=560-610) — that's the jet ending mid-air? Maybe those are splash particles.

Let me check the deposit logic: `const ph = puddleHeight(p.x); if(p.y >= L.floorY - ph)` → L.floorY = 722. So particles need y ≥ 722. The jet at the floor should trigger.

Unless... `deposit(p.x, JET_VOL)` → deposit adds to S.water[i] where i=colIndex(x). colIndex uses L.colW and L.px0 ✓.

Then updatePuddle: 
```
const d = new Float64Array(S.np);
for(...){ ... d[i]-=t; d[i+1]+=t; }
for(...){ S.water[i]=Math.max(0,S.water[i]+d[i]); }
```
This preserves the total. And the HUD sums S.water → should be > 0.

Unless the HUD update happens before... no.

Hmm! Maybe the issue: `S.water` is reallocated in reset() — yes — but updatePuddle uses S.np ✓.

Wait: maybe the particles never reach the floor because they're removed by `if(p.life<=0 || ...)`: life decays at 0.4*dt → from 3s to 0 takes 7.5s. Not it.

OH. I see it: in updateJet, the 'in' mode particles: when they cross the plane they switch to 'out'. But look at the spawn: `const x = plane - dir*rnd(10,70);` For the left side dir=-1 → x = plane + rnd(10,70) = inside the tank ✓. For the right side dir=1 → x = plane - rnd(10,70) ✓ inside. Good.

Then 'out' particles: p.vy += G*dt ✓.

Hmm, so why no deposit? Let me check the HUD: `let tot=0; for(let i=0;i<S.np;i++) tot+=S.water[i];` ✓.

Maybe the deposit IS happening but the puddle is spread thin and the telemetry rounds to... no, it would be hundreds.

Wait — maybe the jet is landing at x < L.px0? No, px0=34.

Let me actually debug: add a temporary check... Time is very short (~1.5 min). Let me think harder.

AH — I found it! In `updateJet` the landing check happens only in the 'out' branch. But look at the order of operations in the loop: `for(let i=S.jet.length-1;i>=0;i--)`. Fine.

Hmm, what about `p.y >= L.floorY - ph`: L.floorY is 722 and the canvas is 800 tall. The jet in the screenshot ends at ~y=610. So the particles are NOT reaching y=722 — they disappear. Why? `if(p.life<=0 || p.x<L.px0-40 || p.x>L.px1+40)`. p.x ≈ 320 ✓.

So life must be hitting 0: life = rnd(3.0,5.0) for 'in' mode, and decremented at 0.4*dt only in 'out' mode. But in 'in' mode: `if(p.life<=0) S.jet.splice(i,1); continue;` — life is NOT decremented in 'in' mode (I only decrement in the 'out' branch). So 'in' particles never die and the array grows... but they're removed when they cross the plane.

Hmm wait, in 'in' mode, `p.life` never decrements → the particle lives forever until it crosses. OK.

So why do the streaks stop at y≈610? Actually maybe the stream continues further down but is thin/dark. Looking again at the image: there's a white streak from (330,400) down to (320,610) — it fades. Could be that the older particles were removed by the life decrement: life from 'in' mode was 3-5 (not decremented) then in 'out' mode decremented at 0.4*dt → 0.4/s → 7.5-12.5 s. Not it.

Unless... `p.life` was already low? No.

OK here's another thought: maybe the jet particles DO land and deposit, but `S.water` is being reset every frame?? No.

Hmm, `updatePuddle` is called every frame ✓.

Let me look at the diffusion math: 
```
const t = (hi-hj)*k*L.colW*0.5;
d[i]-=t; d[i+1]+=t;
```
With hi = 27 (a spike) and hj = 0, k=0.067, colW=4.7: t = 27*0.067*4.7*0.5 = 4.25 → transfers. Total preserved ✓.

So the total should be nonzero after a deposit.

Unless deposit is never called because the 'out' particle never reaches y≥722... The white streaks in the image end at ~610 — suspicious. That's where the jet's parabola lands? The jet exits at the hole (y≈300) with vx≈-90... wait, the hole is at y=328 and the jet exits horizontally at ~90 px/s, then falls. To fall from 328 to 722 = 394px takes sqrt(2*394/1500) = 0.72s → x travel = 90*0.72 = 65px → lands at x = 365-65 = 300, y=722. The screenshot shows the streak ending around x=320, y=610. Maybe the streak just becomes sparse.

I'm out of time for deep debugging; let me add a quick safety: also deposit when the particle is out of bounds, and lower the "floor" detection. Also possible: `S.splash.push(...)` is called on landing, and splashes ARE visible at the bottom (the small dots at x=170-340, y=700 — I see small white dots at the bottom left around y=705!). Yes! There are small dots at the bottom-left (170-340, 700-710) — those are splash particles → so landing DOES happen → deposit IS called.

So the puddle total should be > 0. Unless the splash dots are glass fragments (they look like small triangles at the floor — yes, those are glass shards, since debris fragments are triangles).

Hmm. So maybe no landing occurs and those are shards.

Let me just quickly add a fallback: deposit also when p.y > L.floorY - 4 or when the life expires (assume it lands). And also make the check more lenient. But without debugging, the risk is the puddle never appears.

Time: ~1.5 min left. Let me do a quick targeted check using node to simulate? Too slow.

Alternative quick check: use the browser to inspect S? The DOM doesn't expose S. I could add `window.__S = S;` for debugging — but the sim is closed over. Quick: add `window.S = S;` at the end of the IIFE. Then I can inspect via... the browser tool has no eval action. Only inspect (DOM). Hmm, but I can display the puddle total in the DOM — it IS displayed: "Puddle: 0 px²".

So the puddle is genuinely 0 → deposit isn't happening → particles don't land.

Why? `if(p.y >= L.floorY - ph)`. L.floorY = H-78 = 722. Hmm, is L.floorY correct? H=800 → floorY=722. The floor is drawn at 722 ✓ (in the screenshot the floor line is at ~722 ✓).

So particles must be removed before reaching 722. The only other removal: life<=0 or x out of bounds. 

OH WAIT. I found it! In the 'out' branch: `p.life -= dt*0.4;` but the 'in' branch sets `p.life = rnd(3.0,5.0)`. Fine...

Hmm, but what about `S.jet` particles that are in 'out' mode with p.vx = dir*jetV*rnd(0.85,1.05) where jetV ≈ 88 → vx ≈ -80. Over 0.72s → 58px ✓.

Unless the particle's mode never switches to 'out' for most particles! The switch condition: `(dir<0 && p.x<=plane) || (dir>0 && p.x>=plane)`. plane = L.tankL = 365. The 'in' particles move toward the plane ✓.

BUT: the 'in' mode steering targets `plane` with the speed sp = max(40, jetV*0.85) = 75, and the target point for vy is S.openingY. Fine.

They'd cross the plane... then set p.x = plane and mode='out' ✓.

So they DO become 'out' and fall.

Unless the crossing happens and then... `p.vx = dir*S.jetV*rnd(0.85,1.05)`. With jetV=88 → vx=-75 ✓.

Then gravity pulls them down: after 0.72s they're at y=722 → deposit.

Unless the life ran out: 'in' life 3-5 s not decremented; 'out' decrements at 0.4/s → they need 0.72s → life still > 2. 

So they SHOULD land... unless dt is huge and p.vy overshoots? No, overshoot still passes the check.

Wait, maybe the issue is the ORDER: `const ph = puddleHeight(p.x); if(p.y >= L.floorY - ph)`. Yes.

Hmm, is it possible that `S.jet` particles are landing but `deposit` is called with p.x and colIndex(p.x) is out of range → returns silently? colIndex(300) = floor((300-34)/4.71) = 56 ✓ in range.

I'm stuck on theory; let me just add a robust fallback: deposit on ANY removal of an 'out' particle (life end, out of bounds) at its last position, and also clamp: if p.y > L.floorY → deposit. Plus lower the floor detection to L.floorY (already).

Actually — WAIT. I found it! Look at the update loop for the body/props: no. Look at `updateJet`... the 'in' mode: `if((dir<0 && p.x<=plane) || ...)`. For the LEFT side, dir = -1 ✓ (dir = S.side==='left'? -1 : 1). ✓.

Hmm, what about `S.side==='left'? L.tankL : L.tankR` for plane ✓.

OK, empirical approach: add a fallback deposit when the particle is removed in any way (a helper `land(p)`), and also increase the puddle visibility. Plus, to be safe, ALSO deposit a small amount continuously based on the flux at the impact point... that's hacky but guarantees a puddle.

Simplest robust approach: in updateFlow, each frame deposit `S.flux*dt` into the puddle column at the landing x (the impact point computed from the jet's parabola). But the impact x varies.

Better: keep the particle-based deposit but ALSO add a fallback in the 'out' branch: if(p.life<=0){ deposit(p.x, JET_VOL); remove; }.

Since the mystery remains, let me do a minimal-risk implementation: make the landing test generous:
```
const ground = L.floorY - 2;
if(p.y >= ground){ deposit(p.x, JET_VOL); ... }
```
and on life expiry also deposit.

And to guarantee the puddle is visible, I'll ALSO deposit a fraction of the flux each frame at the impact point computed analytically:
impactX = plane + dir * jetV*t_fall, t_fall = sqrt(2*(L.floorY - openingY)/G).

That's a clean, physically consistent way to guarantee the puddle forms even if particles are lost. I'll add that in updateFlow: deposit(S.flux*dt, impactX) — with the deposit function taking an amount. Then the particle deposit would double count → reduce the particle deposit to a smaller share (e.g., 0) and rely on the analytic one. Let's do: analytic deposit of the full flux at the impact point, and the particles deposit 0 (remove that deposit call but keep the splash).

That guarantees the puddle forms and is volume-consistent (the whole outflow lands in the puddle). The splash still marks the impact point.

Let me implement:
- In updateFlow after computing flux: if flux>0: compute t_fall = sqrt(2*max(0,L.floorY - S.openingY)/G); impactX = plane + dir*S.jetV*t_fall; deposit(impactX, S.flux*dt).

Careful: the deposit must happen where the jet lands, and the puddle then spreads ✓.

Also remove the duplicate deposit from the particle landing (set it to a small 0 or keep a fraction like 0.2 of the analytic? No—remove it entirely to avoid double counting).

Let me apply this now and do a final verification. Time is nearly up, so this is the lastchange.

Intact scene looks good. Now breach and verify the puddle appears. Click Breach thenscreenshot.

Breach just started (fragments flying). Let me wait with a screenshot to see the puddle.

The jet is beautifully curved downward ✓, the waterline is falling (88%) ✓, fish are pressed against the right wall?? Hmm — the fish are all clustered at the top-right corner. That's odd: the current pulls them LEFT toward the hole, yet they're at the right. Why? Because the anti-current steering "away from the hole" is strong (spd*1.1*eff) and they all swim right, piling up at the right wall. That's the "swim against the current" behavior ✓ — reasonable, though they cluster. Fine.

Puddle still 0! The analytic deposit should work: impactX = plane + dir*jetV*tFall*0.92 = 365 - 96*0.92*sqrt(2*(722-328)/1500) = 365 - 88*0.92*0.79... let me compute tFall = sqrt(2*394/1500)=0.72; impactX = 365 - 96*0.72*0.92 = 365-63.6 = 301 ✓. deposit(301, S.flux*dt) → S.water[56] += 8282*0.016=132 → total 132 per frame → the HUD should show a growing total!

Unless deposit() is not being reached: updateFlow is called only when S.breached ✓ (it is). And the flux>0 ✓.

Wait — is `deposit` defined before use? Yes, function declaration hoisted.

Hmm! But S.water — in reset() I do `S.water = new Float64Array(L.np)`. And deposit does S.water[i] += amount ✓.

But updateHud computes tot from S.water ✓ → shows 0.

So deposit isn't adding. Why? colIndex(x): `Math.floor((x-L.px0)/L.colW)` → (301-34)/4.71 = 56.7 → 56 ✓ < 240.

Unless L.np/L.colW are undefined at that moment? L.colW is set in layout() which is called in resize() before reset() ✓.

OH WAIT!!! I see it — in `reset()` I create `S.water = new Float64Array(L.np)` but `updatePuddle` also creates `const d = new Float64Array(S.np)` ✓.

Hmm, so why 0?

... Let me check updateFlow's deposit call placement: it's inside `if(S.flux>0 && L.tankW>0){...}` ✓.

Is `updateFlow` actually called? update() → `if(S.breached){ ... updateFlow(dt); updateJet(dt); }` ✓.

Hmm, but wait: does `deposit` exist in scope? Yes.

Let me check the actual edit applied — maybe the oldText/newText replacement went to a different place. Let me grep the file for "deposit(".

The code looks right. So why is the puddle 0?

AH — I think I've got it: `updatePuddle` runs the diffusion and `S.water[i]=Math.max(0, S.water[i]+d[i])`. The diffusion transfers between columns: d[i]-=t, d[i+1]+=t. If hi >> hj, t is positive and moves water right ✓. Total conserved.

BUT: the leg columns! `if(S.legCols[i]||S.legCols[i+1]) continue;` — this only skips the transfer, not the water. Fine.

Hmm, total should be conserved. Unless... `d` has length S.np and I loop i to S.np-2 ✓.

So the total must be > 0. Unless deposit() returns early: `if(i<0||i>=S.np) return;` — S.np = 240 ✓, i=56 ✓.

Unless colIndex uses L.px0 which... L.px0 = 34 ✓.

Wait — maybe the issue is the HUD: `let tot=0; for(let i=0;i<S.np;i++) tot+=S.water[i];` — S.np is 240 ✓, S.water length 240 ✓.

So why 0?!

Hold on — maybe updateFlow's deposit IS adding but something RESETS S.water. `reset()` is called on resize... not during the run.

OH NO — I see it! In `updatePuddle` I do `S.water[i]=Math.max(0,S.water[i]+d[i])` — but `d` was computed with the OLD water and the transfers. If the spike at column 56 has hi=30 and neighbors 0: t = 30*0.067*4.71*0.5 = 4.7 → d[56] = -4.7, d[57] = +4.7. Then column 57 has 4.7, and next frame it spreads further. The total stays. Unless... Math.max(0,...) clamps negative values to 0 → if a column goes slightly negative, the mass is lost. But the total would still be mostly positive.

I'm out of time. Let me do a quick decisive test: add a tiny debug to display S.water[56] and tot... but the DOM shows Puddle: 0 px².

ALTERNATIVE: maybe `updateFlow` isn't reaching the deposit because `L.tankW>0` ✓, `S.flux>0` ✓ (8282 shown in HUD, which is set in updateFlow!). So updateFlow definitely runs and S.flux>0 → the deposit line must execute.

Unless the deposit throws an exception! If deposit throws, updateFlow would break and the whole update would break — but the sim continues (the level falls). An exception in update would stop the rAF loop. The level IS falling → no exception.

Therefore S.water[56] must be getting zeroed. The only place that zeroes: `S.water[i]=Math.max(0,S.water[i]+d[i])` where d[i] could be very negative → clamp to 0 → mass loss! With a huge spike (132 px² in one column → height 28) and k=0.067: t = (28-0)*0.067*4.71*0.5 = 4.4 → fine, not negative enough.

BUT: the deposit adds flux*dt = 8282*0.016 = 132 per frame to ONE column, and the diffusion moves only 4.4 per frame → the spike grows: each frame +132 in, 4.4 out → after 10 frames the column has 1300 px² → height 276 px!! And the puddle would be a giant spike at column 56 → height 276px, way above the floor. And the HUD total should be > 0 though!

Unless... the total is huge and the HUD shows Math.round(tot) — it shows 0. So the total really is 0.

Hmm, is it possible that `S.water` in the closure refers to a different object than the one updated? `S.water = new Float64Array(L.np)` assigns to the same S object ✓.

WAIT A SECOND. Look at reset():
```
S.water = new Float64Array(L.np);
S.legCols = new Uint8Array(L.np);
```
And in `reset()` the line `S.water.fill(0); S.escaped=0;` was replaced... Let me verify the reset function actually has the allocation. Let me grep.

Also possible: `updatePuddle` might be crashing? No.

Let me just grep the reset function.

The code is correct. So why 0?

OH!!! I FOUND IT. `updateHud()` is called at the END of `update()`, and updatePuddle is called BEFORE updateHud ✓. So the HUD should show the total.

Hmm... unless `S.np` is not 240 in the updatePuddle/HUD context but 1! Remember the initial S definition: `water:new Float64Array(1)`. If reset() is called (it is, from resize), S.water gets 240.

WAIT. resize() → layout() → reset(). And reset() allocates S.water with L.np=240 ✓.

Hmm, so where's the problem?! Let me actually test the logic in node quickly — extract the puddle logic? That takes time.

Alternative: maybe an exception IS thrown in updatePuddle or deposit, and... hmm, if an exception is thrown inside update(), the rAF loop stops. But wait — where do I call requestAnimationFrame(frame)? At the end of frame(). If update() throws, frame() throws → no more frames → the sim freezes. The water level DOES keep falling across my screenshots (100% → 88%), so no freeze.

Hmm, unless the exception happens in draw() only... no, the DOM updates come from updateHud in update().

So: S.flux = 8282 (from updateFlow), and deposit(impactX, flux*dt) is called in the same function right after. It MUST have added to S.water.

...unless `impactX` is NaN! If impactX is NaN, colIndex(NaN) = Math.floor(NaN) = NaN → `if(i<0||i>=S.np) return;` → NaN<0 is false, NaN>=240 is false → so it does NOT return early → S.water[NaN] += amount → this sets a property "NaN" on the typed array (no effect on the numeric elements) → the total stays 0!! THAT'S IT!

impactX = plane + dir*S.jetV*tFall*0.92. All numbers... tFall = sqrt(2*max(0, L.floorY - S.openingY)/G) ✓ number. Hmm, that's fine.

Unless S.jetV is NaN: v = head>0 ? 0.17*sqrt(2*G*head) : 0 ✓.

Hmm, but NaN requires something undefined. L.floorY ✓.

Wait, maybe not NaN but the column index is out of range: impactX = 301 ✓.

Hmm, hold on: is `deposit` perhaps shadowed? No.

Let me look at the actual line 298 context to make sure the deposit is inside updateFlow and not inside a wrong block. Let me printlines 277-300.

The code looks right! So the deposit MUST work... unless `S.water` is a Float64Array of length 1 at that point, i.e., reset() was never called with L.np=240? reset() IS called in resize().

Hmm wait — resize() is called at the end of the script; but ALSO the initial `S.water = new Float64Array(1)`. resize → layout() sets L.np=240 → reset() allocates 240 ✓.

Unless... `L.np` is set AFTER reset in some path? layout() sets L.np=240 before reset() ✓.

OK OK OK. Let me look at the HUD update code again:

```
let tot=0; for(let i=0;i<S.np;i++) tot+=S.water[i];
el('s-pud').textContent = Math.round(tot);
```
S.np = 240 ✓.

So tot should be > 0.

=> Something zeroes S.water each frame. updatePuddle: `S.water[i]=Math.max(0,S.water[i]+d[i])` — if d[i] is hugely negative, the column is zeroed. Consider: deposit adds 132 to column 56 each frame. The diffusion: hi = 132/4.71 = 28, hj = 0 → t = 28*0.067*4.71*0.5 = 4.4 → d[56] = -4.4. Not negative enough.

BUT!!! What about the LEG columns? The legs are at tankL+34 = 399, tankR-34 = 801, and the center 600. Column for 399 = (399-34)/4.71 = 77.5 → 77. So the leg at column 77 blocks the transfer between 77 and 78. Not related to 56.

Hmm, hold on. What about the diffusion at the spike: the spike at column 56 has height 28; the transfer t is computed from the height difference and moved: d[56] -= 4.4, d[57] += 4.4 ✓.

So the total grows by 132/frame. It CANNOT be 0.

...Unless `deposit` is never called because `S.flux>0` is false in that branch — but the HUD shows flux 8282. Hmm, the HUD shows S.flux AFTER updateFlow ✓ (same value).

I'm going in circles. Let me add a quick sanity test: display `S.water.length` and `S.water[56]` in the HUD temporarily, reload, and screenshot. That's the fastest way. Time is very short but I need to fix the puddle.

Actually — WAIT. I bet I know! `el('s-pud')` — the HUD element id is 's-pud' ✓ and the HTML has `<span class="v" id="s-pud">0</span>` ✓.

Hmm, but `updateHud()` is called at the END of update() — AFTER updatePuddle ✓.

Hmm, hold on! Is `updatePuddle` even called? In update():
```
updateObjects(dt);
updateDebris(dt);
updatePuddle(dt);
```
✓.

OK, empirical: let me add to the HUD "Puddle: X / len N / c56 V". Quick edit, reload, breach, screenshot. 2 tool calls ≈ 40s. Then fix.

Actually, maybe a faster hypothesis test: perhaps `deposit()` is being shadowed by a variable named `deposit`? No.

Hmm, one more idea: `colIndex` uses L.px0 and L.colW — but `puddleHeight` and `deposit` use them ✓.

Let me just add the debug output.

Puddle: 0/240/0 → the array length is 240 ✓ and column 56 is 0 (not breached yet).

Now breach and check thevalue.

Interesting! The screenshot shows the tank WITHOUT the crack visible on the glass (the crack is gone because breached) — but the OPENING isn't visible either! The glass left panel is drawn at x=365 but I see no opening. The breach just started (grow ≈ 0).

Also notice: the water level appears at 207 and the tank's left glass wall appears at x=365 ✓.

Wait, there's a problem: the left glass wall is drawn but no opening/jagged edges... grow is small at this instant.

More importantly: "Puddle: 0/240/0" with outflow 43 → the deposit should be adding 43*0.016 = 0.7 per frame at column 56 → after 10 frames = 7 → Math.round → 7, but it shows 0.

So deposit is truly not adding! With colIndex(impactX)... impactX = plane + dir*jetV*tFall*0.92.

AH WAIT!!! `const dir = S.side==='left'? -1 : 1;` — but `dir` is ALSO declared in updateObjects... no, different scope.

Hmm, hold on: in updateFlow, `const dir` and `const plane` are declared inside the if block ✓.

impactX = 365 + (-1)*103*tFall*0.92. tFall = sqrt(2*max(0, 722-328)/1500) = sqrt(0.525) = 0.725. → 365 - 68.7 = 296 ✓.

colIndex(296) = floor((296-34)/4.71) = 55.6 → 55. Not 56! My debug printed column 56 which is off by one — the deposit might be in column 55! And the total would still be nonzero though...

But the total shows 0! Let me print the total more precisely... Math.round(tot) where tot accumulates. If the deposit were happening, tot would be > 1.

OK so: the deposit is NOT happening. The only way: `S.flux>0 && L.tankW>0` → true (flux 43). Then deposit(impactX, S.flux*dt) → i = colIndex(296) = 55 → 0<=55<240 → S.water[55] += 0.7.

Unless deposit() is NOT the function I think — is there another `deposit` definition later in the file that overrides it? Let me grep for "function deposit" — only one at line 236 (from the earlier grep). And the call at 298.

Hmm, is `S.flux*dt` NaN? dt is fine.

Wait... is it possible that `S.water` is REPLACED between the deposit and the HUD read? reset() is only called on resize.

Hmm, but what about `updatePuddle` → `S.water[i]=Math.max(0,S.water[i]+d[i])` — if d[i] is NaN, then S.water[i] = Math.max(0, NaN) = NaN? Math.max(0, NaN) = NaN. Then the total would be NaN and Math.round(NaN) = NaN → displayed as "NaN". It shows 0, so no.

Unless d[i] is very negative for all columns...

AH WAIT!!! I think I've got it!!! Look:

```
const t = (hi-hj)*k*L.colW*0.5;
d[i]-=t; d[i+1]+=t;
```
and then
```
S.water[i]=Math.max(0,S.water[i]+d[i]);
```
This is FINE for conservation... but consider the FIRST deposit at column 55 of 0.7 px². hi = 0.7/4.71 = 0.148. t = 0.148*0.067*4.71*0.5 = 0.023. Fine.

So the total should accumulate to hundreds.

Hmm, so the deposit must not be running. Let me test whether `updateFlow` is even the function being called — maybe there are TWO updateFlow definitions?! The grep showed one at 277. But wait — earlier I did an edit that replaced the updateFlow body... and maybe the file now has a stale duplicate? Let me grep "function updateFlow" count = 1 (from the earlier grep output, only one line 277).

OK, so let me add a direct debug: set el('s-pud') to show `impactX` and `S.flux*dt`. But time is nearly out (~40 s of budget left?).

ALTERNATIVE THEORY: `deposit` is defined in the IIFE scope, but `updateFlow` also in the IIFE ✓.

Hmm, hold on! Look at the deposit function:
```
function deposit(x, amount){
  const i = colIndex(x);
  if(i<0||i>=S.np) return;
  S.water[i]+=amount;
}
```
`S.np` — IS S.np DEFINED?! In the S object literal I defined: breached, t, sinceBreach, side, crackY, crackX, levelY, openingH, openingY, grow, flux, flowMag, jetV, rocks, plants, fishes, props, debris, jet, splash, water, legCols, escaped, drawCount.

**THERE IS NO S.np!** S.np is UNDEFINED! So `i >= S.np` → `55 >= undefined` → false; `i<0` false → so it proceeds → S.water[55] += amount. Hmm, that would still work.

But in updatePuddle: `const d = new Float64Array(S.np)` → new Float64Array(undefined) → length 0! And the loop `for(let i=0;i<S.np-1;i++)` → `0 < NaN` → false → no iterations ✓. Then `for(let i=0;i<S.np;i++)` → `0 < NaN` false → no iterations ✓. So updatePuddle does nothing — fine, no mass loss.

And in the HUD: `for(let i=0;i<S.np;i++) tot+=S.water[i];` → `0 < NaN` false → tot stays 0!!! THAT'S THE BUG! The HUD sums over NaN → 0 iterations → shows 0 even though the water is there!

And `drawPuddle`: `for(let i=0;i<S.np;i++)` → no iterations → the puddle is never drawn! And the diffusion never happens.

Also `colIndex` uses L.np ✓ (fine). And `deposit` uses S.np (undefined) → the guard `i>=undefined` is false → works.

So the fix: use L.np everywhere instead of S.np. Let me replace all S.np with L.np.

That's the fix! Let me do it with sed and also revert the debug HUD line.

The intact scene looks good: tank with water, fish, rocks sinking, plants, floating duck, and the visible crack handle on the left side below the waterline ✓.

Now breach and check the puddle.

The puddle now works: "Puddle: 4 px²" growing, and there's a thin water line spreading along the floor (visible at the bottom, a light line from x=40 to ~1150!). Wait, the puddle line spans the whole floor width? The thin bright line at y=718 spanning the whole width — that's the puddle with a tiny height spread across the whole floor by the diffusion. It's spreading too fast/far (the diffusion with a spike spreads instantly across the floor). It's a thin sheet, which is physically plausible for a thin film but looks odd.

The diffusion k = min(0.45, dt*4.2) = 0.067 per frame → spreading one column per frame effectively → 240 columns in 4 s. Too fast. Let me reduce k to dt*1.2 (0.02/frame) so the puddle forms a visible pool near the impact point and spreads gradually.

Also the debris fragments are visible flying near the opening ✓.

I'm at the end of my time budget. Let me make this one small tuning change (slower puddle spread), then do a final verification: breach → screenshot (jet + puddle + falling level) → Reset → screenshot (intact).

Let me do it fast.

Intact scene ✓. Now breach and verify the jet, waterline fall, and puddle; then Reset.

Click Breach, then screenshot (this takes a few seconds → the jet shouldbe developed).