How to Increase Oxygen in Subnautica
First things first, craft an upgraded O2 tank! The Standard O2 Tank just won't cut it for long dives. Once you get the blueprint, you can build a High Capacity O2 Tank which gives you a lot more breathing room... literally!
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If you're feeling adventurous, you can build the Seamoth or Cyclops submarines. These vehicles have their own oxygen supply, letting you explore without worrying about running out of air.
Don't forget about the Rebreather. It reduces oxygen consumption when you're diving below 100 meters, making your air last longer in the deep!
Just stay close to the surface. No fancy gear needed, just a good old swim to the top whenever your O2 gets low.
Build a Base! Equip it with a Multipurpose Room and a Hatch. Inside your base, you'll have an unlimited supply of oxygen and a safe spot to plan your next dive.
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