The Stat Gauges
Four meters matter in Subnautica 2:
- Oxygen — the most punishing. Depletes with depth and activity; refills at the surface, in Air Plants and with Portable Oxygen Generators. The Air Tank expands capacity; the Rebreather changes consumption at depth (see the Beginner guide).
- Health — damage from creatures, falls and pressure. Heal with cooked food, medkits and (later) Biomods. Food heals over time — eat before, not during, a fight.
- Hunger — drains constantly. Cooked fish and nutrient blocks restore it. Digestion issues with alien food resolve after the Digestion Adaptation.
- Thirst — Water Slugs convert to water bottles at the fabricator; later you can build water purification at base.
Death sends you back to your last bed or the lifepod with a durability penalty on gear and a lost inventory run. You do not lose blueprints or Biomods — only loose inventory. Don't carry irreplaceable materials into unknown territory.
Biomods — the New DNA System
Biomods are biological modifications crafted from alien DNA, unique to Subnautica 2. You pick your first ones at the Bio Lab in the Welcome Center. Recommended early picks:
| Biomod | Effect | Best for |
|---|---|---|
| Dash | Quick burst of swim speed | Escaping predators, exploring faster |
| Oxygen Control | Slows O2 drain | Longer dives before the Air Tank |
| Digestion | Allows eating alien food | Unlocks the full food economy (Angel Comb route) |
| Heat Tolerance | Survive hot biome | Required for Gold / thermal areas |
Adaptations unlock via progression puzzles — the Angel Comb chain grants Digestion and Heat Tolerance. Biomods can be swapped, so experiment.
Crafting & the Scanner Economy
Crafting runs on the classic Subnautica loop: scan → unlock → craft → upgrade.
- Fabricator — basic tools, water, nutrient processing (on the lifepod, later in bases).
- Modification Station — upgrades like the Feedback Resonator (1 Sonic Resonator + 2 Enameled Glass + 2 Conduit Crystal + 2 Strontium).
- Scanner Station — automates fragment scanning in range; worth building at your main base.
- Vehicle Upgrade Console — depth modules and vehicle upgrades (Tadpole Depth Module Mk. 2 etc.).
The scanner economy is the pacing mechanic: every blueprint waits behind fragment scans in wrecks and alien ruins. If you hit a "blueprint wall", you are missing a scan site — check the Vehicles & Tools unlock routes.
Base Building & Power
Habitat Builder unlocks at the Welcome Center. First base priorities:
- Location — shallow, near a cave entrance, close to Titanium and Copper.
- Power — start with the cheapest stable source you can (bioreactor from fish or organic matter is the EA mainstay; thermal if you settle near vents).
- Battery charging — build a charging slot early; a dead Scanner stops progress.
- Storage & fabricator — one locker wall beats hoarding in the lifepod.
Bases can be refunded (Refund Bases mechanic) — check what you keep before deleting a base; only refunds return full materials. Detailed base power math is on the Walkthrough endgame section.
Co-op & Shared Progression
Subnautica 2 supports 1-4 player co-op with crossplay. Key differences from solo:
- Oxygen is per-player; split exploration by role (one diver, one surface support).
- Base power is shared — one well-powered hub beats four weak ones.
- Each player keeps their own Biomods and blueprints; the host owns the story progression save.
- Decoys and repellents shine in co-op — one player baits a Leviathan while the other loots.
Full co-op setup and role advice: FAQ — is there crossplay?
Added by the Buddy System update (EA 1.2, August 19, 2026)
- Proximity voice chat — position-based team audio with push-to-talk added in the September 1 hotfix; you hear teammates clearly only when nearby, which changes how dive pairs coordinate.
- Player revives — downed divers can be recovered instead of skipping straight to a respawn swim, making deep pushes past 200m far less punishing.
- Player trading — hand resources and gear between divers directly, so one player can run a mining loadout while another carries survival supplies.
- Emotes and Tracking Tags — silent communication for teams without voice, and tags to mark routes, wrecks and base candidates for the whole squad.
- New characters — two additional diver characters (Jegna and Grace), plus HUD and Habitat Builder refinements from community feedback.
Subnautica 2 entered Early Access on 14 May 2026. This collection is a dated reference, not a complete current-build inventory; see the developer’s updates for shipped content and future plans.
Next: Full Walkthrough — every Blackbox and the power plant finale →
Buddy System hotfix context
The 1 September 2026 hotfix updates save compatibility tracking and fixes multiplayer inventory, vehicle oxygen and base issues. Match the build and branch when comparing saves or planning a co-op session. Do not assume a save from a newer build can be opened in an older one.