Dive into a freezing underwater adventure on an alien planet. Set one year after the original Subnautica, Below Zero challenges you to survive a disaster at an alien research station on Planet 4546B. Craft tools, scavenge for supplies, and unravel the next chapter in the Subnautica story.
Recent Reviews:
Very Positive (534) - 87% of the 534 user reviews in the last 30 days are positive.
All Reviews:
Very Positive (4,007) - 89% of the 4,007 user reviews for this game are positive.
Release Date:
Jan 30, 2019

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Early Access Game

Get instant access and start playing; get involved with this game as it develops.

Note: This Early Access game is not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“We make our best games when you are involved from the start. The earlier you play, the faster we hear what you want. You can see our plans, our progress, our successes and our failures. This is how we built the original Subnautica. By involving you in the development process, and iterating openly on your feedback, we build better games.”

Approximately how long will this game be in Early Access?

“We can't accurately predict how long Early Access will take. We expect at least approximately one year, and potentially more.”

How is the full version planned to differ from the Early Access version?

“Throughout Early Access, we will release a sequence of updates that add new content to the game. Initially, you will only be able to play in the starting zone and surrounding Biomes. Future updates will add new vehicles (like the Hover Bike), new biomes, and new story areas. Bugs will be steadily reduced and performance steadily increased.”

What is the current state of the Early Access version?

“Below Zero offers currently 1-2 hours of story play time. Starting environments are richly detailed, voice acting is present, and bugs are frequent but often not game-breaking. Performance (frame rate) is poor relative to what we want in the finished game. See the "About This Game" section for more information about what features are implemented so far.”

Will the game be priced differently during and after Early Access?

“The price of Subnautica Below Zero will increase by 25% when we release the finished version.”

How are you planning on involving the Community in your development process?

“Please join us in developing Subnautica: Below Zero. You can follow our progress on Twitter, Facebook, YouTube, Instagram, the Steam Community, and the Subnautica Blog. Receive notification of major update release by signing up to the Subnautica Development newsletter. You can see real-time changes to our source code by following @SubnauticaSCM on Twitter, and give us feedback using the in-game feedback system. The whole development team is available to chat on Twitter, in Discord, and on our forums. See our tasks being tracked in real time on Favro.
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Buy Subnautica: Below Zero


Recent updates View all (4)

March 7

Seatruck Update

Subnautica: Below Zero has received its first big Early Access update. Check out the Seatruck Update Site to see all the sweet new features in action.

  • Seatruck modular underwater utility vehicle
  • Terrifying Squidshark creature 🦑
  • Thermal Spires & Deep Twisty Bridges biomes
  • Playful Seamonkey and their nests
  • Intricately detailed Cargo Transfer Launchpad island
  • Lots of small Early Access improvements

The Seatruck

The Seatruck is a modular Underwater Utility Vehicle. Start by building a cab, then add and remove modules based on your mission requirements. Each additional module slows the Seatruck down. A reversing camera is included as standard. In an emergency, you can detach all modules and escape quickly.


Seatruck Modules
  • Cab - Provides power, live support, cockpit
  • Fabricator - Mobile field equipment fabricator
  • Storage - Ample space for equipment & supplies
  • Aquarium - Collect live specimens

Look out for more Seatruck modules in future Early Access updates!


Lurking within the new Deep Twisty Bridges biome, the Squidshark is a serious threat. Its tentacles can ensnare even the most agile diver. Shark teeth and a powerful bite cause great damage.


An ocean trickster, the Seamonkey will actively seek to steal your kit and swim off with it. Follow them back to their nests and you might find other valuable things they have collected.

Deep Twisty Bridges

Deep Twisty Bridges is a dark, red-accented region with depths exceeding 200 meters. Look out - Some of the plant life is not passive, and might ensnare you in the depths.

Thermal Spires

Rockpunchers and Bonesharks roam between these pointed ocean stacks.

Cargo Transfer Launchpad

Explore a richly detailed island, home to the Cargo Transfer Launchpad. Black sandy beaches, thermal pools, snow-dusted cliffs and intricate caves await you. At the peak, you will find a new Cargo Transfer Base along with attendant rocket launchpad.

Follow Below Zero development

You can find out about upcoming updates in all sorts of ways. Sign up to the Development Newsletter to receive word every time an update is released. Follow the Unknown Worlds and Subnautica: Below Zero Steam groups to get a notification on Steam. You can also:

Enjoy, and happy diving!

- Unknown Worlds

234 comments Read more

February 11

Micro Update Released

A small update has been released! This update is not a major feature release. It contains some bug fixes and improvements, and tries to fix some (but not all!) of the issues your feedback revealed after Below Zero release.

This update also serves to test our new triple-store build deployment system. This system sends the update to each of the Epic, Discord, and Steam stores at the same time. We want to make sure it is working properly before we release a major feature update.

To be notified as soon as we do release our first major feature update, subscribe to the Subnautica development newsletter, follow @Subnautica on Twitter, @Subnautica on Instagram, Subnautica on Facebook, and subscribe to Subnautica on Youtube.

Please keep sending us your feedback! We'd love to hear from you in the in-game feedback system (press F8 while playing), on our forums, or in our Discord chat. Below Zero is still full of bugs, but with your continued feedback we will whittle them away during Early Access.

- Unknown Worlds

A comprehensive changelog follows:



  • Ice floes reworked to look less flat, transition better to snow
  • Reduced oxygen gained from Titan Holefish from 100 to 30
  • Increased Titan Holefish oxygen recharge time to 40 seconds
  • Clarified rocket island signal text
  • Alien cave materials now blend better with surrounding ice
  • Supply drops may now be used when falling
  • Removed Crash Fish spawns outside Sanctuary
  • Spawn fewer aggressive creatures in the one place in Thermal Spires


  • Avalanche + tower falling sounds
  • Camera shake in avalanche sequence
  • Hot springs on rocket island, including terrain tweaks
  • Two new icebergs in shallows
  • Hanging icicles on cave facade
  • Heat effects in proximity to heat sources
  • Pengling hold animations

Bug fixes

  • Various changes to Sanctuary physics including collision mesh
  • PDA now lights correctly in Research Base
  • Research Base collision adjusted to mitigate falling & sticking
  • Tooltip on Research Base prawn suits updated
  • Steam version no longer starts vanilla Subnautica
  • Removed unwanted Supply Drop with "Null" item inside
  • Pengwing spelling error fixed
  • Some tool & walk/stand poses now animate properly
  • Camera no longer clips inside Life Pod
  • No longer possible to use fabricator from outside Drop Pod
  • No longer possible to scan fabricator in Drop Pod
  • Life Pod fabricator can no longer be picked up with Propulsion Cannon
  • Stopped some entity slots (e.g. loot) from floating
  • Removed floating terrain in Shallow Twisty Bridges
  • Removed unused mesh from small coral kelp plant
  • Ladders in ice lake & rocket base may now be used
  • Drop Pod legs will now deploy
  • Drop Pod will now broadcast the correct signal
  • Bioscanner & Biosample may no longer be dropped / lost
  • Pickup up a Builder tool now unlocks the Builder recipe


  • Adjusted Level-Of-Detail on small coral kelp plant
  • Add culling of non-visible objects to elevator in alien base
  • Optimised cloud rendering
  • Disabled clouds when underwater

181 comments Read more
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About This Game

Below Zero is an underwater adventure game set on an alien ocean world. It is a new chapter in the Subnautica universe, and is currently in development by Unknown Worlds.

Watch out!

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.

Return to planet 4546B

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.

Explore new biomes

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.

An ocean of intrigue

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.

About the development team

Below Zero is being created by Unknown Worlds, a small studio that traces its roots back to the 2002 Half-Life mod Natural Selection. It is the same team that created the original Subnautica. The team is scattered around the globe, from the United States to the United Kingdom, France, Russia, Austria, Australia, Germany, New Zealand, Taiwan, and many more places.


This game contains flashing lights that may make it unsuitable for people with photosensitive epilepsy or other photosensitive conditions. Player discretion is advised.

System Requirements

Mac OS X
    • Requires a 64-bit processor and operating system
    • OS: Windows 7 64-bit
    • Processor: Intel Core i3 / AMD Ryzen 3 2.6ghz+
    • Memory: 8 GB RAM
    • Graphics: Intel HD 530 or better
    • DirectX: Version 11
    • Storage: 15 GB available space
    • Additional Notes: Subnautica Below Zero is an Early Access game, and minimum specifications may change during development
    • Requires a 64-bit processor and operating system
    • OS: Windows 10 64-bit
    • Processor: Intel Core i5 / AMD Ryzen 5 @ 3Ghz +
    • Memory: 8 GB RAM
    • Graphics: Nvidia 1050 Ti / AMD Radeon 570, 4GB VRAM
    • DirectX: Version 11
    • Storage: 15 GB available space
    • Additional Notes: Subnautica Below Zero is an Early Access game, and recommended specifications may change during development.
    • Requires a 64-bit processor and operating system
    • OS: OS X 10.11 El Capitan
    • Processor: Intel Core i5
    • Memory: 8 GB RAM
    • Graphics: Intel Iris Pro 650 or better
    • Storage: 15 GB available space
    • Additional Notes: Subnautica is an Early Access game, and minimum specifications may change during development
    • Requires a 64-bit processor and operating system
    • OS: OS X 10.13 High Sierra
    • Processor: Intel Core i7, 4 cores
    • Memory: 8 GB RAM
    • Graphics: AMD Radeon R9 M395 or better
    • Storage: 15 GB available space
    • Additional Notes: Subnautica is an Early Access game, and recommended specifications may change during development.

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