Deep Blue

Dive from the base on Kell in a small research submarine. Read the sonar, watch your air and your depth, and find what lies on the reef shelf, on the ledge 120 m down, and on the trench floor at 300 m.

Everything you see and hear is made in code as the game loads: the island, the sea and sky, the subs, the reef, the creatures, the sound and the music. There are no image or sound files at all, and the game never goes online once it has loaded.

WHAT'S DOWN THERE
- A sunlit reef of coral, sea fans, sponges and seagrass, with light shafts and caustics dancing on the sand
- Golden kelp forests swaying in the swell
- Schools of reef fish, green turtles, manta rays and moon jellies
- The Drop: a wall that falls from 40 m into the dark
- The wreck of the steamer Aldora, lying on the ledge with coral on her deck
- Black smokers on the trench floor, glowing with heat and ringed by giant tube worms
- Deep down, plankton that flashes blue-green when your sub stirs the water

HOW YOU PLAY
- Missions: three dives with par times and gold, silver and bronze medals. Find the sonar buoys, photograph the Aldora's bow, bridge and stern, then take the deep hull down to the vents before the air runs out.
- Free dive: no air limit. Pick the time of day and the weather, and go exploring.
- Logbook: twelve discoveries to find across the shelf, the Drop and the trench.
- Two subs: the nimble Limpet, rated to 150 m, and the Anglerfish, a deep hull rated to 400 m that you earn on the second mission.
- A chase camera, or a cockpit view from behind the acrylic dome with the sonar and instruments live on the console.
- Headlights that throw beams through the murk, a sonar that pings out to 220 m, and a gold beacon over every target.
- Four times of day (Morning, Midday, Golden hour, Sunset) and four weathers (Calm, Fair, Breezy, Squall).

CONTROLS
Keyboard: W / S throttle, A / D or the arrows steer, Q / E or up / down dive and rise, Space sonar, L lights, Shift boost, C camera, Esc pause, hold R to restart, M mute.
Gamepad: left stick steers and dives, the triggers set the throttle, A pings, Y lights, Start pauses.
Phone and tablet: drag on the left to steer and dive, slide the throttle bar on the right, and tap PING, LIGHT and CAM. Tilt steering is in Settings. Play in landscape.

RUNS ON
Any recent desktop browser, and phones and tablets. Settings has a Graphics choice; Low suits older phones. Your progress is saved in your browser.

OFFLINE VERSION
Download the offline zip, unzip it and open Deep-Blue.html in your browser. Nothing to install, and no internet needed.

CREDITS
An original game by Kayode Fashola, built with three.js and Vite with the help of Claude Code. No ready-made assets: everything is generated in code.