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 | | At deep-sea pressures, nitrogen readily dissolves in the blood and tissues and the deeper a diver goes and the longer his dive, the more nitrogen is absorbed. |
 | | If the diver has absorbed too much nitrogen or surfaces too quickly, bubbles of nitrogen form causing various problems, difficulty breathing, joint pain and even death when bubbles form in the heart or cerebrospinal tissues. |
 | | Technical, research, commercial and military divers typically often go far deeper than SCUBA divers and although they use gas mixtures that contain helium to replace most of the nitrogen and prevent nitrogen narcosis, there is a risk of helium bubbles causing decompression sickness. |
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