A Hundred Years of Helium

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I am surprised that no mention was made of the Atlantis dives at Duke, or the Hydra program at COMEX. They were in a chamber, but 2000' plus dives are still impressive.
 
I am surprised that no mention was made of the Atlantis dives at Duke, or the Hydra program at COMEX. They were in a chamber, but 2000' plus dives are still impressive.
Those were hydrogen dives.
 
Those were hydrogen dives.

"Dr. Bennett discovered that the lack of nitrogen in the diver’s breathing environment may be the cause of HPNS. During the Atlantis Drive Series, scientists studied the effects of long-term extreme pressure on the human body by simulating undersea dives when using trimix, a mixture of helium, oxygen, and nitrogen gases."

COMEX Hydra VIII experiment, where a team of professional divers dived to a depth of 536 m/1,752 ft while breathing Hydreliox, breathing gas consisting of 49% hydrogen, 50.2% helium and 0.8% oxygen

 
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