Crash Dive

The crew of the nuclear submarine, the USS Ulysses, rescues victims of a boat disaster. The “victims” turn out to be terrorists intent on capturing nuclear weapons aboard the submarine. The term "crash dive" refers to the sudden diving of a sub to escape detection, an act that a nuclear sub is never supposed to make. Only a former SEAL, now a submarine consultant, can save the crew by sneaking aboard while the submarine is underwater.