Barotrauma Standard Edition

Barotrauma is a co-op submarine simulator set beneath the ice of Europa, and it is at its best when everything goes wrong at once. Up to sixteen players crew a submarine, each taking a role — captain, engineer, mechanic, medic, security officer, assistant — and the sub's systems are all genuinely simulated: reactor output, wiring, ballast, sonar, weapons.

A hull breach floods a compartment while the reactor melts down because the engineer is dead and the assistant is trying to read a wiring diagram. Outside, something large is interested in the noise. The campaign mode runs missions with character progression between dives, and a separate traitor mode assigns one crew member a secret objective to sabotage the run, which changes the atmosphere entirely. It can be played solo with bot crew. Steam Workshop support runs deep enough for total conversions. FakeFish and Undertow Games released it in March 2023.

The Standard Edition is the full game with campaign, sandbox and multiplayer. The Supporter Pack is a separate DLC. Keys activate on Steam; there are no console or GOG versions.