Subnautica: Below Zero is an adventure expansion to the hit survival game Subnautica. The title was developed and released for PC in 2021 by Unknown World Entertainment. Return to the secret arctic 4546B planet and solve the mystery of your sister's disappearance. Story The ice-bound planet of Subnautica sub zero, hides not only secrets but also numerous dangers. Your sister has mysteriously gone missing. And with her, all marks of people who lived here. Discover the secret of the traces of life left here. Explore the history of an alien civilization that once inhabited this planet. Find the courage and strength to survive and ultimately bring things to a happy ending. Gameplay What is Subnautica Below Zero? It is an extensive expansion pack that requires the base game to run. Embark on the adventure of a lifetime and discover the additional content of the base game that is a separate, brilliant story! Relive the journey on 4546B and discover places and secrets you had no idea existed