Oxygen Tunic — Subnautica 2 Creature Guide | Location & Tips
Oxygen Tunic is a passive creature in Subnautica 2 at 0–0m depth. A radioactive tunicate that splits seawater into breathable oxygen — but repeated use risks radon buildup and cancer.
Last updated: 2026-05-15
Overview
Oxygen Tunic (Tunic aeolian). A tunicate with a radioactive core (uranium, radium, or thorium) that powers its metabolism through radiolysis — splitting seawater into hydrogen and oxygen. Consumes the hydrogen; releases oxygen into the surrounding water. Emits a distinctive blue glow from Cherenkov radiation exciting luminescent pigments. Demonstrates that life on this world doesn't depend on photosynthesis like Earth's deep-sea ecosystems. Players can use it as an emergency oxygen source — but repeated use could lead to radon buildup with serious health risks including cancer. Use sparingly.
Stats
| Stat | Value |
|---|---|
| Behavior | Passive |
| Depth Range | 0–0m |
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