Found this on Hyperscale.
All in French, But,
A very impressive build article on using an ancient Leo 45 WW2 bomber model
to make an underwater diorama.
There are also similar diorama's from other builders.
If you have a crap kit & a picture frame, This could be the thing to do.
http://www.master194.com/forum/viewtopic.php?f=4&t=74692
Enjoy
Pete