content: pointed toe entry, knees locked, head up, arms straight up  Interesting. I did a sea survival course years back and they told us that (if we're jumping into the sea from a height) we should hold one arm across our life jacket and the other pinching our nose. The rationale was that the lifejacket could be ripped up off your body if your arms were pointed up and the crotchstraps break, and they claimed that if you hit the water at the wrong angle, the jet of water running up your nose could smack your brain and stun you. Not sure how much BS that was, but that was what they told us.