that ice question is stupid. pulling your knees to your chest is the technique you use underwater to float to the top if you're unable to swim up. you will, however, remain face down in the water. it's takes longer to die of hypothermia than it does to drown. i'd have chosen that answer if i had a snorkel.
I was taught in the Navy to pull your knees to your chest. In addition when I got certified to Ice Dive I was taught that as well. The premise if that it'll stop the flow of water around your core chest area. I never could figure out how to keep your hear afloat. I figured the best thing to do was avout frozen water.
