Subnautica is an underwater survival adventure developed and published by Unknown Worlds Entertainment. After a long early-access period on Windows, the 1.0 PC release shipped in January 2018, with console ports following across that generation—check your storefront for the exact package you own.

You play a survivor of the starship Aurora, stranded on the almost entirely oceanic planet 4546B. Core play mixes free diving, scanning flora and fauna, crafting tools and vehicles (including the Seamoth, PRAWN suit, and Cyclops), building seabases, and following environmental storytelling delivered through PDAs, wrecks, and habitats.

• Open-ended exploration across kelp forests, plateaus, caves, and progressively deeper biomes.
• Pressure, oxygen, and hostile wildlife create tension alongside hunger and thirst.
• A contained science-fiction plot you can chase at your own pace—avoid spoilers if you prefer discovery-first.