Barotrauma

Barotrauma is a 2D co-op submarine simulator with survival horror and RPG elements, developed by FakeFish and Undertow Games. The game takes place in the distant future beneath the frozen, irradiated surface of Jupiter's moon, Europa, where the remnants of humanity live in a punishing subaquatic environment. Players must work together to command a submarine, manage its highly complex engineering systems, and defend against terrifying alien sea monsters