A new update is available for Subnautica: Below Zero Early Access. To see this subject's article on the Subnautica Wiki, click here. Leviathan is a classification given to extremely large creatures in the world of Subnautica. A reworked Glacial Basin biome also awaits you as you return, plus the introduction of cold mechanics, and escalating weather conditions. This article is about Leviathan Class Organisms in Below Zero. This update features the latest update to the story, as well as an all new intro cinematic.