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