Cast
Pat O'Brien
Mike Farrough
Edgar Buchanan
Charles Atterbee
Jessie Busley
Mrs. Mudge
Frank Baker
Detective
Marjorie Gateson
Mrs. Winslow
Bruce Bennett
Ship's gunnery officer
Dick Rich
Perrin's Henchman at Dock
Constance Bennett
Christine Blaine
Wyndham Standing
Man
John Halliday
John Morgan
Francis Pierlot
Professor Mudge
Don Beddoe
Ship's Chief Engineer Anderson
Norbert Schiller
Submarine First Officer
Alan Baxter
Larry Perrin, alias Larry Ross
Erwin Kalser
Dr. Adolph Behrens
Douglas Gordon
Ship's Lookout
Frank Sully
Tommy Malone
Olaf Hytten
Agent
Melville Cooper
Ship's Mate Penney
Stanley Logan
Captain James P. Hollister