Astronauts and people in airplanes can just sit in a pressurized suit or cabin and come down back to Earth without any trouble, but for some reason divers need to slowly resurface even though they’re still only feeling one earth atmosphere in their suits and undersea chambers. Why do nitrogen and other gasses build up if the divers are only under one atmosphere of pressure?
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If they were under 1 atmosphere pressure they wouldn’t need to, no more than a submariner has to.
But a pressurized suit isn’t going to help a diver, the problem is too much pressure already, which causes excess gas to dissolve in your blood and needs decompression time to come out again. What you need is a rigid, pressure resisting enclosure, ie a submarine with manipulators.
A spacesuit maintains 1 atm against outside vacuum, the drop in pressure if it ruptured would cause similar gas bubble formation as a diver returning to the surface from pressure at depth
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