Re: Submarine Movies
The Enemy Below - excellent WWII flick told from both the American destroyer (Robert Mitchum) and German u-boat (Curt Jurgens) POVs.
The Bedford Incident - excellent Cold War movie with a obsessed American captain (Richard Widmark) hunting a Russian sub. Excellent supporting cast with Sidney Poitier.
Operation Petticoat - Cary Grant, Tony Curtis, and nurses on board a pink submarine.
Pay attention to the open sky