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When a diver surfaces too quickly he gets 'the bends'.

As the diver goes down, the pressure causes nitrogen to dissolve in the blood. That's harmless.

On the way up the diver must allow time for the nitrogen to come out of the blood slowly. If the diver comes up faster than the recommended timing, the nitrogen gas will form bubbles and block small blood vessels, causing 'the bends' a painful and life threatening condition that is cured by putting the patient in a pressure chamber and bringing the pressure down very, very slowly.

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Q: What happens when a diver surfaces too quickly?
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