Scuba diving has achieved remarkable popularity in the years since Jacques-Yves Cousteau and Emile Gagnon developed the demand valve regulator and portable air tank in 1943. The Professional Association of Diving Instructors (PADI) alone has certified over 5 million divers worldwide. Diving also plays a role in numerous occupations in the military, industry, and scientific research.
Breathing gas under pressure can present a myriad of possible medical problems. One of these is decompression sickness or "the bends," caused by breathing nitrogen or other gases under pressure, which are not metabolized by the body.
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