Submarine Alert

Submarine Alert (1943) - Lee Deerhold (Richard Arlen) is an out-of-work radio engineer caring for a sick child. He is approached by two men who recruit him to work on a secret project. Lee soon realizes he is working for Nazi spies on an illegal transmitter designed to locate and obliterate Allied ships. The FBI and American military join in the race to locate and destroy the enemy's transmitter before more American lives are lost.