Subnautica: Below Zero introduces a mechanic absent from the original game: temperature. The planet 4546B in Below Zero has both arctic land environments and cold deep ocean areas where your survival depends not just on oxygen but on maintaining your body temperature. The Cold Suit is the key piece of equipment that makes extended land exploration viable. This guide covers how to find, craft, and use the Cold Suit, plus general land survival strategy for Below Zero’s arctic environments.
The Temperature Mechanic
Below Zero tracks your body temperature alongside oxygen and hunger. On land in arctic areas, your temperature drops continuously. In the ocean, temperature varies by biome — shallow warm areas are safe, but deep cold regions drain temperature alongside oxygen. When your temperature falls to critical levels, your health begins to drain. Without the Cold Suit (or access to a heat source), exposure to arctic conditions is quickly lethal.
In the early game, before you have the Cold Suit, your time on land is strictly limited. Use the First Aid Kit’s warming effect to extend your land exploration window, and always have a heated indoor space — your Lifepod, a base module, or a warm cave — within reach before venturing onto the arctic surface.
Finding Cold Suit Blueprints
The Cold Suit blueprint is found in fragments scattered across the early-game underwater areas near the delta and initial exploration zones. Scan every piece of blue-tinted equipment debris you find — Cold Suit fragment components are distinguishable by their thermal-focused design. You need three fragment scans to unlock the complete Cold Suit blueprint. Once unlocked, you can craft it at the Fabricator with basic materials.
Cold Suit Upgrades
The base Cold Suit provides adequate thermal protection for the accessible arctic areas. For the deeper cold regions and the more exposed Arctic Spires area, upgrades improve the suit’s insulation significantly. Cold Suit upgrades are crafted at a Vehicle Upgrade Console and require materials found in the colder biomes — an appropriately circular requirement that encourages progressive exploration. The full upgrade chain makes Robin effectively immune to cold damage in all but the most extreme conditions.
Land Survival: Practical Tips
- Build Thumpers before crossing Ice Worm territory — essential for safe land traversal without the creatures attacking
- Keep a Spy Pengling with you for reconnaissance — it can access areas Robin cannot and avoid triggering Ice Worm detection
- Maintain your temperature meter actively — do not let it fall below 50% without a heat source nearby
- The Snowfox hovercraft dramatically speeds up land travel and reduces exposure time in dangerous surface areas
- Mark warm caves and surface heat vents with Beacons so you can find them quickly in an emergency
- Land exploration is easier in the cold biomes once you upgrade the Oxygen Tank — more air means more time for careful temperature management
Cold Survival on RicardoPlays
Ricardo’s Below Zero series on the RicardoPlays channel covers the first land exploration sequences — including the early cold damage panic when temperature management is not yet understood — and the subsequent mastery of arctic survival with a fully upgraded Cold Suit and Thumper network. The channel’s Below Zero content is a practical demonstration of these techniques in real gameplay.