Chris Anthony spends his life finding whopping great mountains in the most out of the way places and skiing down them so he's used to spectacular scenery and amazing adventures. However, his latest experience in the Sierra Nevadas in America left him breathless - literally. He went on a high altitude survival training course with the US Marines and part of the deal was skiing, with a fully laden pack, into a hole carved in frozen lake by a maniacal instructor. Brrrrrrrrrr!