The movie, Gray Lady Down, is a tense action-adventure film about a nuclear submarine named Neptune which is rammed by a Norwegian freighter, falling 1,400 feet before coming to rest on a crumbling sea-shelf.  The only chance to save the crew rests with a diving expert and his untested two-man sub which is summoned to make a rescue attempt.  Starring Charlton Heston, David Carradine and Stacy Keach among others.  Full screen in color.  Released in 1978.  Runtime 111 minutes.