"(...) Divers must breathe different mixtures of gas at different depths, so Bedard breathed from a tank of pure oxygen until she had descended about 30 feet. Then she switched to nitrox, a combination of oxygen and nitrogen.
About 130 feet down, she switched to her primary tanks, which were supposed to contain a blend of oxygen, nitrogen and helium appropriate for that depth.
They didn't.
Banks realized something was wrong with Bedard, who switched back to her nitrox tank. The two began their ascent, according to witnesses' statements to the commission. (...)"
About 130 feet down, she switched to her primary tanks, which were supposed to contain a blend of oxygen, nitrogen and helium appropriate for that depth.
They didn't.
Banks realized something was wrong with Bedard, who switched back to her nitrox tank. The two began their ascent, according to witnesses' statements to the commission. (...)"
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