I'm a diver and 6 atmospheres would be deeper than 160 feet which is much deeper than recreational diving allows. Also she was in there for 5 years which means her blood would be completely nitrogen saturated. In other words, she would have as much liquefied nitrogen in her blood stream as it would absorb which isn't the problem. The problem in the "out-gassing". As pressure is decreased, the nitrogen returns to it's gaseous state. A good illustration of this is when you open a bottle of carbonated liquid, like soda. The pressure being released allows the liquefied carbon dioxide to return to gas. If you open it very slowly, it will out-gas without bubbling up. Same in the human body. Release the pressure too quickly and the nitrogen will bubble up in the bloodstream which can be fatal depending on the level of saturation and out-gassing time. Deep sea, commercial divers that are down in the thousands of feet have to spend WEEKS or more in a decompression chamber to keep from experiencing "the bends" or decompression sickness. I'm not an expert but I feel that going from 6 atmospheres to 2 as quickly as she did would have killed her but assuming it didn't, the bubbles would still cause problems in her body such as severe joint pain that would be dealt with in the decompression chamber she was shown in. So if it didn't kill her (as depicted) she would most likely make a full recovery.
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