National Geographic has an "Ultimate Soldiers" tv series where they push the best soldiers in the world to their limits to see what they can do. I found some extremely interesting tests and scenarios there, you can watch a lot of different episodes at their site. One that was really cool was a Marine Corp Scout Sniper in a 130F heat chamber for 20 minutes who could control his heartbeat and slowed it from 135BPM to around 80BPM, even though he was in prolonged extreme heat and then shot a target dead on BETWEEN HIS HEART BEATS. Pretty cool. Anyway, the other one I'm going to post here is pretty crazy, an ex Navy SEAL is submerged in a tank of ice water for 60 minutes, and then runs an obstacle course and eliminates an enemy target at the end, and he is still dead accurate. That guy is super lethal. The scientists expected him to last 30 minutes max till they had to pull him out due to core temperature of 95F which is when hypothermia starts, but somehow he stayed in for 60 minutes, and he only got out cuz they asked him to, and his core temperature was still in normal levels, 99F. Pretty awesome.
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