Abyssus

There is no land on Thalassa-9. Only eight oceans, stacked one beneath the other, and 100,000 kilometers of water between you and whatever is waiting at the bottom. Every sea ends on solid rock. Your drill is the only way through — but drilling is loud, and the deep is listening. The moment you bite into the floor, your submarine is pinned in place and everything in that sea comes for you. Hold position. Finish the hole. Fall through into the dark below. 

THE EIGHT SEAS 

The Light Sea — coral, fish, safety. Enjoy it. 

The Veil Sea — endless jellyfish forests. Something walks between them. 

The Wreck Sea — the ghost fleet of everyone who tried before you. 

The Ember Sea — volcanic fields where the water burns. 

The Ice Sea — drifting bergs above a mile-thick sheet of eternal ice. 

The Silent Sea — almost empty. Almost. 

The Titan Sea — a graveyard of fossilized giants. Some are not fossils. 

The Heart Sea — no floor. Just the thing that has been beating this whole time. 

WHAT'S DOWN THERE 

15+ creature types, each with its own behaviour — swarms that hunt as a single mind, krakens with animated tentacles, armored titans that curl into invulnerable balls when shot, and leviathans in six variants: ghosts that phase through your torpedoes, volts that drain your oxygen, bone skeletons that fire projectiles at you. And below them, the legends: the Bloop, whose scream cracks your hull from kilometers away. Charybdis, a living maelstrom with teeth. Umibōzu, who only light can drive away. Jörmungandr, a wall of scales with no beginning and no end. Gargantua, a wandering mountain with forests growing on its back. Tiamat and her five hungry heads. 

WHAT YOU DO ABOUT IT 

Mine titanium, copper, lithium and ruby — free-floating chunks and ore nodes on the sea floor - Upgrade a drill, torpedoes, a close-range laser, a shield, and a companion drone that fights alongside you - Build deep stations as checkpoints — repair, refuel, respawn - Research species by killing them; your sonar learns to name what it sees - Read the logs of dead expeditions and the tablets of a civilization that stopped digging - Drill permanent shafts that stay open forever — the route down is one you carve yourself - Fight a multi-phase final boss, then take everything you own into New Game+ 

CONTROLS WASD 

 arrow keys — move Shift — boost Hold ↓ at the sea floor — drill B — build deep station  M — drop mine K — map · C — bestiary · ESC — pause Torpedoes fire automatically. Your floodlight has a limit. The dark does not. Runs in your browser. No install. Progress saves automatically. Available in English and German.