Re: 6 Americans, 1 Brit vanish at sea
Nina's , deckhouse , is a very similar in design to the Smeeton's Tzu Hang which was twice pitchpoled in the Pacific while attempting to round Cape Horn. On both occasions the structure was torn away and had it not been for John Guzzwell's intervention (he was crewing) the Tzu Hang would have probably gone down. I'm not saying that would have been a quick sinking but it shows how "easily" timber deck houses can be torn away.
“Give a man a fire and he's warm for a day, but set fire to him and he's warm for the rest of his life.” Terry Pratchett