Increase your oxygen storage with the High Capacity Air Tank upgrade in Subnautica 2.

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 ...

Even if you didn't know it before you started Subnautica 2, it'll quickly be obvious once you start the game that you'll be spending nearly every second of your playthrough underwater. Unfortunately, ...