If the player dies, they respawn, but certain items are removed from their inventory. In survival mode, the player manages their depleting health, hunger, thirst and oxygen.Upon beginning a new game, players are given an option between four difficulty modes: The majority of the game is set underwater, with two explorable islands hidden across the map, and a simulated day-and-night cycle that affects visibility. Some of the most extreme dangers to the player include dangerous fauna like Crabsquids, Bone Sharks, Ampeels, Stalkers, Crashfish, and Leviathan-class lifeforms like the Reaper, Sea Dragon and Ghost Leviathans. Players can collect resources and blueprints, construct tools, build bases and submersibles, and interact with the planet's wildlife. The main objective is to explore the ocean and survive its dangers, while completing tasks to advance the plot.

The player controls the lone survivor of the crashed spacecraft known as Aurora, Ryley Robinson, as he is stranded on a remote ocean planet known as 4546B in the Galaxy of Andromeda.

Subnautica is a survival action-adventure game set in an open world environment and played from a first-person perspective. A sequel, Subnautica: Below Zero, was released May 14, 2021. By January 2020, more than five million copies had been sold. The Nintendo Switch, PlayStation 5, and Xbox Series X/S versions were released in May 2021. The physical console versions were published by Gearbox Publishing. It was released out of early access in January 2018 for macOS and Windows, with versions for PlayStation 4 and Xbox One in December 2018. Subnautica was released in early access for Windows in December 2014, macOS in June 2015, and for Xbox One in May 2016. The main objectives are to find essential resources, survive the local flora and fauna, and find a way to escape. They are free to explore the oceanic planet. Players control a non-essential systems maintenance chief who is the only survivor of a spaceship crash on an alien planet. Subnautica is an action-adventure game developed and published by Unknown Worlds Entertainment.

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