John Thorson
Wallace Beery
'Rocky' Blake
Chester Morris
U-Boat Petty Officer
Hans Joby
Ensign Dyer
Henry Hunter
Admiral Girard
Jonathan Hale
Recruiting Officer (uncredited)
Leon Ames
Fisherman (uncredited)
Arthur Belasco
Joseph E. Bernard
Wade Boteler
Al Bridge
Listener (uncredited)
Rand Brooks
Radio Operator (uncredited)
Don Castle
Susan Thorson
Virginia Grey
Sailor (uncredited)
Jack Chapin
Lieutenant (uncredited)
Tom Chatterton
Captain (uncredited)
Jack Rube Clifford
Man with Finch (uncredited)
Jules Cowles
Mrs. Gill (uncredited)
Leigh De Lacey
Joe De Stefani
Petty Officer (uncredited)
Edgar Dearing
Lookout (uncredited)
Richard Elmore
Frank Faylen
Survivor (uncredited)
Budd Fine
District Commander
Douglass Dumbrille
Allen Fox
Frederick Lee
Eddie Hart
Edward Hearn
Surgeon (uncredited)
Howard Hickman
Earle Hodgins
Wireless Operator (uncredited)
Clarke Jennings
Boy (uncredited)
Payne B. Johnson
Signalman (uncredited)
Charles Jordan
Lew Kelly
U-Boat Captain
Carl Esmond
Jack Kennedy
Milton Kibbee
Nurse (uncredited)
Claire McDowell
Larry McGrath
Orderly (uncredited)
Roger Moore
Philip Morris
Naval Aide (uncredited)
Forbes Murray
Old Sailor in Bilge Area (uncredited)
Frank Orth
Wireless Operator Sending Coded Message (uncredited)
Syd Saylor
Engineer (uncredited)
Harold Schlickenmayer
'Cap' Finch
Clem Bevans
German Operator (uncredited)
Ferdinand Schumann-Heink
German Sailor Looking for Wireless (uncredited)
Hans Schumm
Cook on Tugboat (uncredited)
Harry Semels
Lee Shumway
German Sailor (uncredited)
Robert R. Stephenson
Shore Patrol Sailor (uncredited)
Harry Strang
Young German Sailor (uncredited)
Walter Thiele
Junior Officer Standing by Map (uncredited)
Emmett Vogan
German Officer (uncredited)
Wolfram Von Bock
Hans von Morhart
Milo
John Qualen
Doodles Weaver
Ives
Regis Toomey
German U-Boat Officer
Henry Victor
Admiral Ross
Addison Richards
Director
George B. Seitz
Music
David Snell
Sound Director
Douglas Shearer
Director of Photography
John F. Seitz
Set Decoration
Edwin B. Willis
Art Direction
Cedric Gibbons
Edward Ward
Costume Design
Fred Valles
Producer
J. Walter Ruben
Assistant Art Director
Urie McCleary
Editor
Frank E. Hull
Dolly Tree
Story
Ralph Wheelwright
Screenplay
Wells Root
Harvey S. Haislip