Cast 34

1. 

   Pat O’Brien

   Mike Farrough

2. 

   Constance Bennett

   Christine Blaine

3. 

   John Halliday

   John Morgan

4. 

   Alan Baxter

   Larry Perrin, alias Larry Ross

5. 

   Erwin Kalser

   Dr. Adolph Behrens

6. 

   Edgar Buchanan

   Charles Atterbee

7. 

   Frank Sully

   Tommy Malone

8. 

   Marjorie Gateson

   Mrs. Winslow

9. 

   Francis Pierlot

   Professor Mudge

10. 

    Jessie Busley

    Mrs. Mudge

11. 

    Melville Cooper

    Ship's Mate Penney

12. 

    Stanley Logan

    Captain James P. Hollister

13. Leslie Denison

    Ship's Mate Jones

14. 

    Don Beddoe

    Ship's Chief Engineer Anderson

15. 

    Norbert Schiller

    Submarine First Officer

16. Frank Alten

    Submarine Radio Operator

17. 

    Bruce Bennett

    Ship's gunnery officer

18. Rex Post

    First Mate

19. 

    Dick Rich

    Perrin's Henchman at Dock

20. 

    Olaf Hytten

    Agent

21. Arthur Mulliner

    Detective

22. Frank Baker

    Detective

23. Frank Benson

    Sailor

24. Bobby Hale

    Sailor

25. Fred Wolff

    German Sailor

26. Douglas Gordon

    Ship's Lookout

27. Jean Prescott

    Mrs. Hollister

28. Hans von Morhart

    German Sailor

29. Paul Michael

    German Sailor

30. 

    Wyndham Standing

    Man

31. Arno Frey

    Submarine Gunner

32. David Dunbar

    Sailor

33. James Kilgannon

    Sailor

34. Hans Schumann

    Submarine Commander

Crew 2