All the other Ice water challenges look tame by comparison:
https://www.youtube.com/watch?v=FjCjW3_FBSM
https://www.youtube.com/watch?v=FjCjW3_FBSM
I did the Tough Mudder run a few years back, they take a shipping container, and fill it with cold water, and ice. Then you jump in, and halfway across there is a board that blocks your progress, so you have to go under it, it's about a foot and a half below the surface, and goes up about 3 feet above, with barbed wire at the top so there is no climbing over. So under you go, then wade to the other side, and climb out. That's all the "Ice water challenge" I ever care to have. And the only way I'm doing it again, is if I do another Mudder.
Joe