Originally Posted by
Mopheus
Boats without flotation can go under very, very quickly. If you don't have flotation foam or a sealed underfloor area, taking a single wave over the stern can be all it takes.
There once was a vid on Youtube (since removed, unfortunately) of a small boat in the 16-18' range trying to haul up a stuck crab pot, as viewed from a camera up on the dash or bimini. They hauled on the line, dipping the starboard aft corner, and took a single wave over the stern. They realised they'd taken on water and released the line but it was too late - a couple of hundred litres of water inside meant the next wave breached over the stern as well, and it was off to Davey Jones's locker from there. As far as I recall it took around 10-15s between the first wave and the camera going under.
IMO the key safety messages are:
1. Wear an inflatable PDF. They're so unobtrusive that there's really no reason not to.
2. Mount the EPIRB at the stern where it's accessible if the boat sinks out from under you.