During World War II, Captain Cassidy and his crew of submariners are ordered into Tokyo Bay on a secret mission. They are to gather information in advance of the planned bombing of Tokyo. Along the way, the crew learn about each other as they face the enemy and some of them lose their lives.

• Warner Bros. Pictures
• Cary Grant
• John Garfield
• Alan Hale
• John Ridgely
• Dane Clark
• Warner Anderson
• William Prince
• Robert Hutton