starman
gee . . . you know how to ask a hard question. It's been ages since I've seen the movie. Which subs do you mean - the navy one at the start; the underwater search vessel; or the little white rescue/exploration subs?
Besides doing an internet search on a search engine (which I'm not gonna do) the best bet would be to get as much picture/movie stills as possible - that may mean buying the DVD and freezing it at those sences (a common thing agmonst sci-fi modelers) or getting the extras off the DVDs. Next I would head over the Starship Modeler and post this on their board - besides sci-fi models theres heaps of people that do movie stuff.
http://www.starshipmodeler.com/index.htm
best of luck - sounds like an interesting subject - I esp like the sence at the end where the two mini subs are locked together with one hanging over the edge of the cliff!