Oxygen is crucial to survival in Subnautica 2, but your starting O2 meter can feel a bit restrictive. The rarest resources (and coolest stuff) can only be found in the deepest parts of the alien ocean ...

Microscopic ocean algae produce a huge share of Earth’s oxygen—but they need iron to do it. New field research shows that when iron is scarce, phytoplankton waste energy and photosynthesis falters.

This is a detailed guide and walkthrough showing how to obtain a Rebreather and increase oxygen efficiency in Unknown Worlds' ...