> Gasping and panicking, they inhaled water. Friðþórsson, by contrast, managed to control his breathing. He later described remaining clear-headed throughout his swim. I wish the article had gone into Friðþórsson's breathing a bit more. It seems like this and/or his body fat are what kept him alive.
You get used to that cold shock, I take a cold shower every day for many many years, and quite frankly I don't feel a "cold shock" anymore, even in winter. It's really just requires a bit of training to get less sensitive to cold; on the other hand I also have a tendency to get warm a lot quicker, which can be a bit annoying sometimes. I keep my house at 18C and no warmer, when many people I know want 21C or sometime…
I'm currently only taking cold showers, this is the third time I've started doing so. The very first one was quite an experience: my vision turned gray for a few seconds, I couldn't breathe, and I nearly fell over. The next day's was a little jarring but tolerable, and it kept on like that, a little less each day.
Then I fell out of the habit. My second and third times getting back into it, I didn't experience nearly the same drastic physiological effects, it was Day Two over and over again.