Wikipedia
Subnautica
Subnautica is an open world survival game in development by Unknown Worlds Entertainment. Subnautica allows the player to explore an aquatic alien planet by scuba diving and traveling in submersibles, while collecting resources and food to survive. It was released on Steam Early Access on December 16, 2014, and is currently in development for Xbox One. Full V1.0 release is planned for December 2016.