I think that would be pretty cool.
Well it would be easy for the devs as they wouldn't have to build anything solid. No clip or collision issues as it's a ghost.
IT would be cool if it was a moving wreck. It changed position relative to the divers location but once inside the diver would move with the wreck as there would be no relative water movement.
ghost ship in the goonies cave 8-)
haha that would be awesome.