Boatammo: We retrieved a lot of "hypothermia" victims who were thought to have drowned.
I handled 3 or 4 "zipper-down drownings" - these were usually retired men who went out fishing alone in their 12' aluminum kicker boats in the cold waters of Puget Sound/Elliott Bay. And when time came to relieve themselves they stood up "unzipped" and let fly! Sadly they would fall in that desperately cold water and before they could struggle back into their boats they would die of hypothermia!
They would almost always have PFD's on though - which made them easy to find.
Yeah nothing good about humans drowning (or dying of hypothermia!) - other than it is a relatively quick way to go.
Hold into the wind
VarmintGuy