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 are using an Atmospheric Dive Suit (ADS) which are essentially submarine suits, they don’t as the suit maintains normal sea level air pressure. If you’re talking hardhat divers, those guys are breathing pressurized air and special gas mixes to cope with the effects of extreme water pressure. If you’re breathing under pressure, even with Nitrox, TriOx, etc your blood will saturate with nitrogen and you must decompress slowly to avoid gas bubbles forming.
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