How high air pressures can a human survive?

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SUMMARY

The maximum air pressure a human can survive is significantly influenced by the gas mixture, particularly the percentage of oxygen. At depths of 700 meters, the oxygen concentration must be reduced to below 1% to prevent toxicity, necessitating continuous adjustments to the gas mix during deep dives. Scuba divers experience air that is approximately six times denser than at the surface, which affects their breathing frequency and duration. Experimental dry chamber dives have reached depths of 3500 feet, highlighting the extreme conditions faced in commercial diving.

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Does anyone know what is the maximum pressure in which a human body
can function? And how does air pressure affect the minimum breathing frequency?
I suppose increased pressure would allow a person to hold breath longer. For example:
a scuba diver or a person in a diving bell 50m bellow water surface would breathe air that
is about 6 times denser than above surface. If that air had normal oxygen share would it
allow the person to hold breat 6 times as long as above the surface?
 
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The deepest commercial diving is about 700m
I think somebody did an experimental dry chamber dive of 3500ft but I can't find the details

The difficulty is that oxygen becomes toxic at high pressures - so as you go deeper you need to lower the percentage of Oxygen.
At 700m you have < %1 O2, since you can't breath this at sea level you have to continually adjust the gas mix as you go deeper.
 

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