Some of you probably know about the "human seal" Lynne Cox -- a woman with tolerance for cold far beyond what should be physiologically possible, and author of the book "Swimming to Antarctica".
Natalya Avseenko does Lynne Cox one better -- she swims naked under the ice, periodically taking breaths from her safety diver's octopus:
https://www.youtube.com/watch?v=EqOynt13mCQ#t=319
Unfortunately the video is in Russian. I found a version with French subtitles, but not English. Warning: NSFW (nudity).
Natalya Avseenko does Lynne Cox one better -- she swims naked under the ice, periodically taking breaths from her safety diver's octopus:
https://www.youtube.com/watch?v=EqOynt13mCQ#t=319
Unfortunately the video is in Russian. I found a version with French subtitles, but not English. Warning: NSFW (nudity).