Minesweeper
Lt. Richard Houston (Richard Arlen) is an officer in the U.S. Navy who deserted during peacetime service to escape gambling debts, and took up life as a hobo. The Japanese attack on Pearl Harbor spurs him to rejoin the Navy under the assumed name of Jim "Tennessee" Smith. Houston is assigned to serve aboard a minesweeper, where he carries out numerous successful efforts to defuse mines in the San Diego harbor while struggling to keep his identity secret.
Complicating matters, Houston gets involved in a love triangle, competing with Seaman Elliot Nash (Russell Hayden) for the affections of Mary Smith (Jean Parker), niece of Chief Petty Officer "Fixit" Smith (Guinn "Big Boy" Williams), who has taken a liking to Houston. Later, while gambling, Houston overstays his shore leave and Smith, having taken over his position, is killed by a mine.
Confessing to Mary that he was out gambling to get the money to buy an engagement ring, Houston is crestfallen that by his AWOL, he was responsible for the death of his friend. Houston nearly deserts again, but instead returns to his base to take on one last mission. Reporting back to duty and finding that his immediate superior, Lt. Ralph Gilpin (Frank Fenton) has discovered his true identity. Nonetheless, even as a "prisoner-at-large", Houston volunteers to help clear the shipping lanes of mines to ensure a troop ship can safely leave the harbor to join a convoy off to the Pacific.
When Houston and Nash dive in San Diego harbor to find a Japanese mine, the two divers see that the mine reacts to the sound of an aircraft overhead, beginning to rise from its tethered location as the sound waves reach it. Nash relays the information to Lt. Gilpin on the diving launch, but Houston cuts Nash's oxygen line, forcing the crew on the diving launch to pull him up to safety. Operating on his own, he attempts to open the control panel when the mine explodes, killing Houston. On board the diving launch, Nash tells the crew that Houston is a true hero.
Giplin realizes that he can counter the threat of the mines by flying aircraft low over the water where they can be blown up after they rise to the surface. Looking at the cable he received about the deserter, he tears it up and drops it overboard.
A Consolidated PBY Catalina flying boat flying at low level triggers the release of the acoustically sensitive mines in San Diego harbor, allowing the minesweepers to blow up each mine. As the operation finishes, the Secretary of the Navy sends a message indicating that the Navy and Marine Corps Medal has been posthumously bestowed on Gunner's Mate First Class James Smith, United States Naval Reserve.
violence