On December 6, 1941, Captain Yamanada of the Japanese aircraft carrier "Hiranamu", orders full steam ahead for Pearl Harbor. His ship encounters and sinks an American yacht and the single survivor, Sue Curry, is rescued by an American submarine, the "Sea Serpent", commanded by Commander Chris Warren. He hears her story and attempts to radio a warning to Pearl Harbor. Yamanada, hearing the signals, orders the airlines jammed, and then sends his son into the air to sink the sub. The attack fails, after the sub makes a crash dive, but they fail in their warning attempts. The next morning, December 7th, the men on the sub hear the story of the bombing of Pearl Harbor, and devise a desperate plan to sink the Japanese carrier by letting the carrier know their position. The carrier comes in search of the submarine.

John Howard
as Commander Chris Warren

Marguerite Chapman
as Sue Curry

Bruce Bennett
as 1st Office Russell

Warren Ashe
as Bill Warren

Forrest Tucker
as Pulaski

Eileen O'Hearn
as Vera Lane

Nino Pipitone
as Captain Yamanada

Philip Ahn
as First Officer Kawakami

Larry Parks
as Sparksie

Roger Clark
as Grant Duncan
CinemaSerf
For some reason an American causing yacht finds itself in the middle of the Pacific Ocean and in the way of a Japanese aircraft carrier. The bigger ship uses it as target practice leaving only "Sue" (Marguerite Chapman) as the sole survivor. Fortunately, she manages to get of an SOS and that was pic...