Subnautica is an open-world survival adventure developed and published by Unknown Worlds Entertainment. Set on an alien ocean planet, players must explore vast underwater environments after crash-landing on an unknown world. The game combines crafting, base building, resource management, and deep-sea exploration while uncovering a mysterious storyline. With vibrant marine ecosystems, dangerous creatures, and immersive survival mechanics, Subnautica delivers a unique underwater survival experience on PC.