Planned Release Date: Nov 26, 2026

About This Game

Go down. It's waiting.

Unknown Depths is a co-op horror descent for 1 to 4 players. Your team climbs down a vast, procedurally generated shaft, far too big and open for comfort, and something in the walls is listening.

It hunts by scent

Move fast, by sprinting, swinging or falling, and you leave a trail of glowing dust behind you. After a quiet spell the rock near you shudders, cracks and something grows out of it. You'll hear it before it feeds: a rising, clicking rattle, jaws shuddering open and the dust starting to drift its way. Then it breathes in across the shaft, pulls your scent straight to it and follows the trail.

If it reaches you, you're gone.

Light is the only shelter

Lanterns, glowing fungus, crystals and shrines hold back the dark. Inside their light you leave no scent, and the worm can't breathe you in or grow into the light. So you dash from one pool of light to the next, and every dash leaves a trail.

One hook, one rope, a long way down

Every diver has a grappling hook on about 25 metres of rope. Catch a ledge, swing across the open shaft, rappel down sheer drops or haul yourself back up. Hook a teammate to pull them to safety, or rope yourselves together. Falls hurt, stamina runs out, and a swing into rock at the wrong speed can kill you before the worm does.

Together, until you aren't

Death is instant. The dead watch the living, and kindling a shrine brings the whole team back. When nobody is left, the shaft rolls anew. Every run is a different descent.

Features

• Online co-op for 1 to 4 players

• A procedurally generated shaft that's different every run, where your score is your depth

• A creature that grows out of the walls and hunts by scent, not sight

• Physics-driven climbing, swinging and rappelling with a grappling hook

• Three difficulties: Easy, Normal and Nightmare, where more than one worm hunts you

• PS1-style visuals: wobbling vertices, dithered colour and thick fog

Mature Content Description

The developers describe the content like this:

Unknown Depths is a horror game. Players are hunted by a large worm-like creature that bursts out of the cave walls, and being caught kills the player instantly. Expect a tense, dark atmosphere, sudden scares and loud creature sounds. Deaths are not very graphic.