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No, unless you mean in water then yes, depending on how deep you go. I saw on discovery that people who deep sea dive have to be decompressed after because the pressure on their lungs when they go so far down into the ocean.

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Half right. You've not quite understood decompression.

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In deep sea diving the body's internal pressure becomes that of its surroundings, more or less. The diver breathes air or a special gas mixture whose pressure fed to the diver is adjusted automatically by the "regulator" valve to be always very slightly below ambient, so he or she can breathe normally through the mouthpiece.

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What you are talking about - decompression - is to allow nitrogen in the bloodstream to disperse naturally. Too rapid an ascent will make it effervesce, creating bubbles that can lodge in blood-vessels and cause at least severe pain. So the diver stops for a calculated time at certain points on the ascent, to decompress. Sometimes he or she may switch to breathing pure oxygen during this, but at fairly shallow depth, to purge the excess nitrogen from the blood. Even with all these precautions divers still have to be careful what they do for at least a day after the diving day, and diving tourists are told not to dive on the day before they are due to fly home. They go snorkelling or sight-seeing instead.

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For the deepest dives, specially- calculated mixtures of gas are used to avoid another danger: oxygen poisoning. This occurs when oxygen is breathed at high pressure, .i.e. at quite considerable depth.

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