Re: Bad things that happen at sea.
Again, no data per se, but I think that the majority of losses are usually reported as rescues or attempted rescues. Very few people are so disconnected these days that they could disappear without anyone noticing and raising an alarm. Of course if they were and did they wouldn't show up in stats either.
Probably more cases of people (esp singlehanders) going overboard and the boat eventually drifting/sailing to a landfall where it's noticed...
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"