Subnautica is a 2018 action-adventure survival game created and published by Unknown Worlds Entertainment. In the game, players control Ryley Robinson, a person who survives a spaceship crash on an alien planet covered by oceans. Players can explore the planet freely, with goals to gather needed resources, avoid dangerous plants and animals, and find a way to leave the planet.
The game was first available for purchase on Windows in December 2014, macOS in June 2015, and Xbox One in May 2016. It was fully released for macOS and Windows in January 2018, with versions for PlayStation 4 and Xbox One coming in December 2018. The physical copies for consoles were published by Gearbox Publishing. Versions for Nintendo Switch, PlayStation 5, and Xbox Series X/S were released in May 2021. A version for Nintendo Switch 2 was released in February 2026. Critics gave the game mostly positive reviews, and it sold more than 5 million copies by January 2020.
A spin-off game called Subnautica: Below Zero, which was originally planned as extra content for the main game, was released in May 2021. A direct follow-up game, Subnautica 2, is expected to be available for purchase in early access in May 2026.
Gameplay
Subnautica is a survival game with action and adventure elements, set in a large, open world and played from a first-person view. The player controls Ryley Robinson, the only survivor of a crashed spacecraft called The Aurora, who is stranded on a distant ocean planet named 4546B.
The main goal is to explore the ocean, survive its dangers, and complete tasks to move the story forward. Players can gather resources and blueprints to build tools, bases, and submersibles, and interact with the planet’s wildlife. Some of the most dangerous creatures include Crabsquids, Warpers, Mesmers, Bonesharks, Ampeels, Stalkers, Crashfish, and large predators like the Reaper, Sea Dragon, and Ghost Leviathans.
Most of the game takes place underwater, with two islands to explore. A simulated day-and-night cycle affects visibility, and eclipses occur often. When starting a new game, players can choose from four difficulty levels.
The game works with VR headsets like the HTC Vive and Oculus Rift. Players can also use a keyboard, mouse, or game controller for input.
Plot
About 1,000 years before the events of the game, an alien group called "the Architects" studied the ocean planet 4546B to find a cure for Kharaa, a disease that had severely harmed their civilization. They discovered that the Sea Emperor Leviathan naturally produces a cure, called "Enzyme 42," in its digestive system. However, the last remaining member of this species was too old to make enough of the enzyme. Attempts to force its eggs to hatch so the enzyme could be collected failed. As the situation worsened and Kharaa spread throughout the ocean, the Architects placed 4546B under automatic isolation and left the planet.
Centuries later, the spaceship Degasi crashed on 4546B while searching for minerals. Three of its crew survived for an unknown period, but by the time the game begins, they had either died or left the area. Ten years later, the spaceship Aurora, owned by Alterra Corporation, crashed on 4546B while searching for the Degasi wreck. The player character, Ryley Robinson, was one of many Aurora crew members who escaped in pods. He was knocked unconscious during entry into the planet's atmosphere and was the only survivor when he awoke. Ryley was contacted by the trading ship Sunbeam, which responded to Aurora's distress signal. When Sunbeam tried to rescue Ryley, it was destroyed by a large alien weapon.
Ryley discovered the weapon was the Architects' "Quarantine Enforcement Platform," designed to stop any ship from entering or leaving the planet's atmosphere to prevent Kharaa from spreading. Ryley tried to disable the weapon, but the control panel detected that he was infected with Kharaa and ignored his commands.
Ryley explored the planet and learned about the Architects through their facilities. He eventually found the last surviving Sea Emperor, which was held in an Architect containment unit and could communicate using thoughts. Ryley activated a teleporter in the Sea Emperor's aquarium to allow its young to escape. In return, the Sea Emperor gave Ryley the recipe for an enzyme that would help the eggs hatch. Ryley used the enzyme to hatch the eggs, which released large amounts of Enzyme 42 into the environment, curing Ryley and all other infected organisms on 4546B. The Sea Emperor, now at peace, said goodbye to Ryley and died.
With the planet cured, Ryley could finally disable the Quarantine Enforcement Platform. He built an escape rocket using blueprints from the Aurora wreck and left the planet. In a final message sent as Ryley left, the Sea Emperor compared itself to Ryley in a poetic way. The game then ended.
In a post-credits scene, Ryley's PDA informed him he would not be allowed to land until he paid 1 trillion credits to Alterra Corporation for using their resources. The natural resources of 4546B are considered the private property of Alterra.
Development
Subnautica was announced by Unknown Worlds Entertainment on December 17, 2013. Charlie Cleveland was the director and lead gameplay programmer, and Hugh Jeremy was the producer. The music for the game was composed by Simon Chylinski.
Charlie Cleveland was greatly influenced by Minecraft, which he said "transformed the game industry" and "changed how games focus on challenges and progress." The release of Minecraft happened at the same time as Unknown Worlds released Natural Selection 2. After feeling tired from working on that game, the team wanted to try something new and decided to create a game like Subnautica. Other influences included scuba diving, the films of James Cameron, and the experience of exploring the deep, dark, and sometimes beautiful or dangerous ocean. Cleveland did not originally think of the game as a survival game but as an exploration game. The team also wanted to make a non-violent game without guns after being inspired by the Sandy Hook school shooting.
The development team chose to use the Unity engine instead of Spark, the engine used for Natural Selection 2. Hugh Jeremy explained this decision because the game had different needs for the engine, and the team did not have people working on Spark. He said using Unity allowed Spark to develop in one direction while Subnautica developed in another. He compared using Spark for Subnautica to "trying to fit a square peg in a round hole."
Subnautica does not have a traditional mission or quest structure, which was a deliberate choice. Cleveland said that intrinsic rewards encourage players to do activities for their own value. He added that after a learning period, players might find the activities enjoyable on their own. This idea came from an essay by Jamie Cheng, who used similar ideas in his game Don't Starve.
Early versions of Subnautica were released on Steam Early Access on December 16, 2014, and on Xbox One Preview on May 17, 2016. At first, the game did not include hunger or thirst mechanics. After receiving feedback, the team added these features, which helped players understand the early parts of the game. The full version of the game was released on January 23, 2018, for macOS and Windows computers, and on December 4, 2018, for PlayStation 4 and Xbox One consoles. Later, versions for Nintendo Switch, PlayStation 5, and Xbox Series X/S, along with a spin-off called Subnautica: Below Zero, were released on May 14, 2021. Below Zero was available in early access on January 30, 2019.
In May 2025, Playdigious announced that Subnautica would be released on Android and iOS platforms on July 8, 2025. As of that date, the game was officially launched and is available for download on both platforms. The mobile version includes the complete original game with all core modes—Survival, Freedom, and Creative—optimized for mobile play. It also includes cloud saves, controller support, and a redesigned interface for touchscreen controls.
Reception
Before the game was released, Subnautica received positive reviews. Ian Birnbaum of PC Gamer compared Subnautica to "an underwater version of Minecraft," saying that "with a skilled developer leading the project and many different ocean areas to explore, it will be difficult for Subnautica to fail. As more tools and features are added, and the final goals of the game become clearer, Subnautica will show how survival can be challenging, satisfying, and enjoyable." Marsh Davies of Rock, Paper, Shotgun praised the game's rewarding exploration but noted that some in-game recipes were not easy to understand or follow.
At its launch, the game received "generally positive reviews" on all platforms, according to Metacritic.
By January 2020, over 5.23 million copies of the game had been sold across all platforms.