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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Regardless of their suit being water tight or pressurized (which is a whole other conversation) its the issue of their air supply. Try to think about their tank. If you want to put more than a few breaths worth of air in there you have to pressurize the hell of out the gasses going into the tank. As you breathe in that compressed air it gets into your blood stream and stays a bit compressed because of the pressure of the depth you’re at. The deeper you are the more weight of the water pushes on you and keeps those gasses compressed. As you ascend the pressure decreases. Those compressed gasses in your blood starts to expand. That is why you need to decompress, so those gasses have some place to go as you breathe them out. If you don’t they’ll expand like ice in a garden hose and start wrecking your blood vessels. The suit here is not the issue, the air you’re breathing is.
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