Is it because to be abondoned in the middle of the water means that the crew just vanished with no easy means of eacape or that the crew to just leave by jumping in the water as a last result possibly means they were escaping something?
I heard about one ship that went around the Bermuda and it "disappeared" and when people found it some centuries later the crew was gone but it seemed that it wasn't really damaged at all and there was food looking prepared as if to be served for the next day
The last one is probably from thousands of years ago or something in which a Pompeii esque event happened leaving ash statues of the victims. They are in a circle because they are using their final moments to pray to the Gods. Hope this helps you sleep at night. :)
chrisovens51 = fail. Pompeii's eruption didn't leave ash statues - the ash cloud that erupted from the volcano buried the victims (in some cases, alive). Over time the remains decomposed, leaving an empty void within the solidified ash (well, not just ash - pumice, stones, ash and general debris, mainly). When archeologists found the site of Pompeii in the 1800s, they carefully poured plaster into these voids. Once the plaster had solidified, they chipped away at the solidified 'ash', leaving the plaster casts... NOT ash statues. It would be nigh on impossible to carry out such a process underwater, and it does not happen naturally, so these are indeed man-made sculptures :)
But your theory isn't bad either!