***there was a sandwich where a comparatively modern vessel was on top, an ancient vessel beneath, and under that, a more ancient vessel.****
Hmmm. Sounds like an old movie I saw years ago.
THE DEEP.
http://www.imdb.com/title/tt0075925/
Is that the one where a pretty girl with a nice figure wears a wet shirt a lot.
If so it was a good movie.