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?