The show was interesting, but a fairly cursory overview. One thing that intrigued me was the suggestion that ice climbers train their capillaries to dilate by soaking their hands in slushy icewater. Any truth to that?
Also, in the desert segment they suggested that if you couldn't find shelter from the sun you should dig a hole and get in it because the temperature can be ten or more degrees cooler only "a few feet down". I don't know about you, but when I dug a conical hole 3 feet deep to try a desert water condenser, it was a heck of a lot of hot, sweating work (and I had an excellent shovel). To dig a hole big enough to get in at that depth, you would be generating a lot of body heat and water loss. Any opinions on whether it would be worth it?