WHEN CMDR. TOM REYNOLDS TRIES TO SELECT A NAVY OFFICER CAPABLE OF LEADING AN EXPERIMENTAL SUBMARINE WITH A STEAM ENGINE, THE ONLY CANDIDATE HE CAN FIND IS RESERVIST LT. HARKNESS. HARKNESS TRIES TO LEAD HIS CREW TO SUCCESSFUL TRIALS OF THE SHIP, BUT EVERY EFFORT PROVES TO BE A DEBACLE. WITH HIS MEN BECOMING DISCOURAGED AND THE SHIP NOW A LAUGHINGSTOCK, HARKNESS MUST FIND A WAY TO MAKE THE SHIP FUNCTION BEFORE REAR ADM. TENNANT COMES CALLING. STARRING GARY COOPER, LEE MARVIN, CHARLES BRONSON, EDDIE ALBERT, JANE GREER, JACK WEBB.