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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The drop in pressure going from sea level to a pressurized airplane cabin is very small compared to the drop in pressure going from deep underwater back to sea level. It *can* be dangerous for people with certain medical conditions to go up in airplanes though.
That said, divers aren’t under one atmosphere of pressure. I’m not sure where you get the pressurized suit thing from, deep sea divers acclimate to pressure on the way down and on the way back up. Sometimes they’ll be inside submersible diving bells or capsules but those are at the same pressure as the water around them.
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