Shi! happens in the ocean and you see it all the time. I used to run chesapeake bay charters in the mid 80's on weekends out of Smith Point Virginia and a good friend of mine went down during the late december rockfish season, no mayday no nothing. He was on his way back to dock after dropping off 6 fisherman and that was it. To this day no one knows what happened but he must of hit a dead head or something that put a 9 inch hole in the hull and went to the bottom pronto. Frank