Interesting read. Also has a 10 min video on the Coast Guard's Cold Water Boot Camp.
http://gcaptain.com/cold_water/?11198
"Article Was Written By Mario Vittone. Mario Vittone has nineteen years of combined military service in the U.S. Navy and Coast Guard. His writing on maritime safety has appeared in Yachting, SaltWater Sportsman,On-Scene, Lifelines, and Reader's Digest magazine. He has lectured extensively on topics ranging from leadership to sea survival and immersion hypothermia. He is a marine safety specialist with the U.S. Coast Guard."