there's less oxygen at higher altitudes...
i've talked to a lot of the sub guys in the navy (i'm int he navy and thank god i'm not a sub guy) and they say that normally when they are underway in a sub they keep the oxygen around 17-18%!!! thats like being at high altitude. Whenever they come up for fresh air at sea level they get high!!! cuz they are getting so much o2 in their bloodstream and they can't go to sleep after that. Like when they are doing fire drills they crank up the oxygen so they get more energy and stay awake, when they go on watch, they turn it down and they feel sluggish....
i've talked to a lot of the sub guys in the navy (i'm int he navy and thank god i'm not a sub guy) and they say that normally when they are underway in a sub they keep the oxygen around 17-18%!!! thats like being at high altitude. Whenever they come up for fresh air at sea level they get high!!! cuz they are getting so much o2 in their bloodstream and they can't go to sleep after that. Like when they are doing fire drills they crank up the oxygen so they get more energy and stay awake, when they go on watch, they turn it down and they feel sluggish....
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