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