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If he’s going to stay up there for more then a couple minutes oxygen is needed otherwise he risks a severe decrease in cognitive ability or possibly a loss of consciousness. It may be possible but it would be stupidly dangerous. Also I don’t think Mt. Everest is a good example. Sure people climb it without oxygen, but they take weeks to get acclimated on the way up. At 26,000ft you reach a point where it is physically impossible for humans to adapt at all (With the exception of visiting with acclimation for a small period of time. Can you explain or back up your statement that he doesn’t need oxygen?