Subnautica  Subnautica is an open world survival action-adventure video game developed and published by Unknown Worlds Entertainment. In it, players are free to explore the ocean on an alien planet, known as planet 4546B, after their spaceship crashes on the planet's surface. The player must collect resources and face creatures to survive. "Subnautica" was released in early access for Microsoft Windows in December 2014, Mac OS X in June 2015, and for Xbox One in May 2016. It was released out of early access in January 2018 for Microsoft Windows and macOS, with versions for Xbox One and PlayStation 4 in December 2018. By January 2020, "Subnautica" had sold more than five million copies. A sequel, called "", is currently in development which was released into early access on January 30, 2019. "Subnautica" is a survival action-adventure game set in an open world environment and played from a first-person perspective. The player controls the lone survivor of a waylaid spacecraft called the Aurora, stranded on a remote ocean planet named "4546B". The main objective is to explore the ocean and survive its dangers, while also completing tasks to advance the plot. Players can collect resources, construct tools, bases, and submersibles, and interact with the planet's wildlife. The majority of the game is set underwater, with two explorable islands, and a simulated day-and-night cycle that affects visibility. Upon beginning a new game, players must select a difficulty mode from the following four:   The game supports VR headsets, such as the HTC Vive and the Oculus Rift, with the additional input of a keyboard and mouse or game controller. "Subnautica" takes place in the late 22nd century, when humanity begins to colonize other star systems. The "Aurora", a deep-space vessel constructed by the "Alterra Corporation", has been sent to a system at the outer reaches of known space on its maiden voyage. Its primary mission is to build a section of high-speed space travel infrastructure known as a Phasegate in the Ariadne wing of the galaxy. However, its secondary mission, unknown to most of the crew, is to search for and, possibly, rescue the crew of a ship called the "Degasi", which crashed on planet 4546B ten years prior. After the "Aurora" enters orbit of 4546B, it is physically waylaid by a mysterious force and crash-lands on the planet.