humans don't do that. but company have drop his body temperature, as i said, and that drops his need for any or some oxygen and he was able to survive the lack of oxygen. i won, the brain-damage that we would have anticipated, the kidney failure, all the thing that could have happen, it's still a very strange story to me. >> anyone being at that altitude in an unpressurized environment, altitude is incredibly painful among many other things. if, again this, is true, could we have done irreparable damage to himself? >> absolutely. >> brain-damage? >> absolutely. yes. years ago on mount everest we made measurements of cognitive function of people who were climatized. the brain doesn't come back the same. we have somebody 30% higher than mount everest and no