A red bioluminescent jellyfish descending through the fictional HEATSOAK ocean

ABYSSAL TRANSMISSION // HS O01

HEATSOAK OCEAN

No rain. No surface. Something warm is moving below the light.

Thirteen abyss zones. User controlled motion. Sound begins only when requested.
HSOCEAN // THERMAL ABYSS
DEPTH00000M
SPEED00.0KT
PRESSURE001BAR
HULL100PCT
SIGNAL0000PTS
STREAK00X
SONAR LANCE100

VEIL // ABYSSAL PASSENGER

The water is black enough to hold anything we bring into it.

ZONE 01 // RED DESCENT
HS SUBMERSIBLE // NERITIC 01ABYSSAL DRIVE SYSTEMVESSEL COLD
OXYGEN 099BATTERY 100TRIM 000LOAD 000

Arm the vessel. Hold the propulsor. Raise throttle to move. Arrow keys or WASD fly, aim, and dodge. Space fires. F drops a depth charge. G raises the shield. H welds the hull. B drops ballast. R pulses sonar. L controls floodlights.