Subnautica: Below Zero is a standalone expansion to Unknown Worlds' beloved underwater survival game Subnautica, set two years after the events of the original on the same alien ocean planet, 4546B. You play as Robin Ayou — a xenobiologist who crash-lands in the frozen wastes of Sector Zero, a new arctic region of the planet — on a personal mission to discover what happened to her sister Sam, who was working at an Alterra research station that was mysteriously abandoned. As Robin digs deeper into the cover-up, she uncovers a story that reaches far beyond Alterra's secrets.

Key Features: • Standalone expansion — set two years after Subnautica, no prior game required • Arctic biome — surface ice exploration alongside deep underwater diving • New creatures, vehicles and base-building — Crystal Caverns, Twisty Bridges and more • Full voice acting — Robin and alien companion Al-An drive a character-focused story • Multiple game modes — Survival, Freedom, Hardcore and Creative