TITLE: NAUTILUS — the drop
PROMPT: Create 'NAUTILUS — the drop', a bathyscaphe descent: scroll (or drag the depth lever) to plum from sunlit surface through twilight into abyss — the water column grades from turquoise to absolute black, pressure and temperature gauges climb/fall, bioluminescent creatures appear at their true depth bands (lanternfish, siphonophore chains, a dumbo octopus, a sperm whale silhouette passing with sonar clicks), marine snow drifts upward as you sink, and the searchlight cone only matters in the dark. Interactions: depth lever or scroll drives the journey with easing; the spotlight follows your pointer in the dark zone and startles bioluminescent flashes; creature clicks open placards with depth and fact; a SONAR ping (WebAudio, gesture-gated) briefly outlines everything in rings; reaching the seabed reveals a hydrothermal vent field. Deep, calm, awed.
DESCRIPTION: A scroll-driven descent from surface to the hadal seabed at 10,900 m. The water column repaints continuously — turquoise to navy to absolute black — while marine snow drifts upward past the sinking viewer and bioluminescent flashes bloom once past 1,500 m. Five depth zones (surface, 600 m twilight, 2,400 m midnight, 3,800 m hadal approach, the vent-field bottom) each carry expedition copy, live pressure/temperature readouts, and auto-revealing creature placards (lanternfish, siphonophore chains, sperm whale clicks, black smokers). Below 2,200 m a pointer-following searchlight cone appears and startles bioluminescent sparks; the SONAR button sends expanding rings with a synthesized ping-and-echo; a fixed depth rail with ticks and a glowing cursor tracks the drop.
TECHNIQUES: depth-interpolated water color mapping, upward-drifting marine snow particle field scaled by sink rate, bioluminescent radial-gradient flashes with pointer-startle, searchlight cone via CSS custom-property radial gradient, expanding sonar ring system with WebAudio sine ping + delayed echo, IntersectionObserver placard reveals, fixed depth rail with major/minor ticks.
INTERACTION: Scroll to sink (or press the sonar); move the pointer below 2,200 m to sweep the searchlight and startle glowing plankton; creature placards reveal as you pass (or tap); the depth HUD and rail track the drop continuously.