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 January 2017.

Gameplay:

The player controls in first-person view the lone survivor of a crashed ship on an aquatic planet. The main objective of the player is to explore the open world environment and survive the dangers of the planet. Subnautica allows the player to collect resources, construct tools, bases, and submersibles, and interact with the planet's wildlife.Players must keep themselves adequately hydrated and fed, and must also maintain their oxygen supply while traversing underwater (Survival Mode). The game includes a day and night cycle. The game also includes other three modes: the Freedom mode, in which only hunger and thirst are disabled, Hardcore mode, which is the same as Survival, except If the player dies, the player will no longer be able to respawn and Creative mode, in which the hunger, thirst, health, and oxygen features are disabled, all the crafting blueprints are acquired, items need resources to be crafted and the submersibles do need energy and can be damaged. The game is mainly set underwater, but there are two fully explorable islands.