Subnautica is an underwater survival game set on an alien planet that is currently available through Early Access. Your ship, the Aurora, has been struck by a mysterious energy pulse and you have been forced to crash land on an unknown alien planet. You are the only survivor after managing to escape in a life pod which has landed in the world's ocean and know you must find food and water to survive. While it is only single player at the moment, Unknown Worlds have said that it will be the first priority after they have built a solid single player experience. most probably after v1.0 http://store.steampowered.com/app/264710/ I'll be keeping an eye on this one for sure, great steam reviews so far for a EA game.