Well, it wasn’t so much swimming as much as we jumped in and jumped out.  (I’m the one in brown on the left and Keith’s on the right)  The water was 4°C and it HURT.  When the first wave hits us at 0:53, I felt myself go into mild shock; I actually could not willfully move for a second.  I decided I didn’t want the second wave to slam into me, so I dove into it two seconds later and felt like I hit a wall of cold fists.  My resulting roar and sprint out of the water was completely involuntary.  Alex later commented, “you looked like Hugh Jackman in X-Men: Origins coming out of the tank.”  Walking back to the truck, my feet felt completely numb so I had no problem walking over rocks barefoot, and they felt three times bigger, what with all the blood that rushed into them.  My eyelids felt like someone was pushing into them with their nails.  Other than that, I recovered pretty quickly and warmed up fast, too.  Would I do it again?  Definitely.