Dive into a freezing underwater adventure. Below Zero is set in an arctic region of planet 4546B. As a scientist posted to a research station on the planet's surface, you are tasked with studying alien artefacts...

The Vesper space station orbits high above you, sending supplies, instructions, and receiving samples you launch from the surface.When disaster strikes the research station, you must improvise to survive: Construct habitats, scavenge for resources, hunt for food, and craft equipment.

Swim beneath the blue-lit, arching growth of Twisty Bridges. Navigate treacherous ice floes on the ocean surface. Clamber up snow covered peaks, and venture into icy caves. Maneuver between steaming Thermal Vents. Below Zero presents entirely new environments for you to survive, study, and explore.

Discover new lifeforms in the icy depths of 4546B. Swim through the giant Titan Holefish, escape from the aggressive Brute Shark, and visit the adorable Pengwings. Some residents of the frozen ocean will help you, and some might try to harm you.

Who were the aliens who came here before? Why were they on this planet? Can you trust your commanders? Below Zero extends the story of the Subnautica universe, diving deep into the mystery introduced in the original game. Open up new story elements with every Early Access update.

Below Zero is not finished! It is in active development: Full of bugs, missing features, and performance issues. If you would like to play Below Zero when it is finished, follow our development progress. We'll keep you informed as updates improve the game.

A new update is available for Subnautica: Below Zero Early Access. Explore the Crashed Ship wreckage, descend into Deep Lilypads, experience the incredible beauty of the Aurora Borealis and more!

• Explore the mysterious Crashed Ship: The wreckage of a mysterious Crashed Ship is scattered across the ocean floor of Planet 4546B. What secrets are hidden inside? You’ll need to be prepared for anything as you explore every crevice for clues!
• Interact with the playful Trivalve: These adorable and playful creatures are curious about your presence! Interact with and feed them, and you’ll find they’re a friendly companion on your continued journey.
• Uncover the perilous Brinicles: Though enticing and awe-inspiring, don’t venture too close to the protruding Brinicles. These perilous ice formations can cause some serious damage.
• Descend into the shadowy depths of Deep Lilypads: Illuminated by the faint light of the flowers that grow there, the Deep Lilypads are ripe with resources and lead to further Architect discoveries to be made.
• Encounter the stunning phenomenon of the Aurora Borealis: Encountering this rare event across the skies of 4546B is an incredible sight to behold. The Aurora Borealis is a stunning phenomenon and one you don’t want to miss.
• Further improvements and polish to existing biomes: Take some time and re-explore the biomes of Below Zero that you are already familiar with. Additional polish and improvements have been made to Lilypads and Thermal Spires, as well as a tune-up to the Hoverbike!

This update will be your last opportunity to play Below Zero’s story in its current form. As previously announced, a new story will be coming in our next update!

Subnautica: Below Zero is currently available through Steam Early Access for $19.99