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ELI5:Underwater cave, water to roof of cave except for 1 spot where cave is higher up. I swim up to breathe ALL the oxygen. Will oxygen replinish??
ELI5:Underwater cave, water to roof of cave except for 1 spot where cave is higher up. I swim up to breathe ALL the oxygen. Will oxygen replinish?? * /r/explainlikeimfive
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