Cast
Steve Pendleton
Ens. Richard 'Dick' Cabot (as Gaylord Pendleton)
Larry Kent
Lt. 'Mac' McGregor
Joseph Depew
Naval Reservist (uncredited)
Jack Murphy
Naval Reservist (uncredited)
Harry Tenbrook
Winkler (uncredited)
جورج أوبريان
Cmdr. Robert 'Bob' Kingsley
Warren Hymer
'Lug' Kaufman
William Collier Sr.
Mugs O'Flaherty (uncredited)
Ferdinand Schumann-Heink
Adolph Brucker (uncredited)
Mona Maris
Fraulein Lolita
Walter C. Kelly
Chief Mike 'Guns' Costello
Walter McGrail
Chief Joe Cobb
Francis Ford
Eric - Captain of Trawler (uncredited)
Edward Peil Jr.
Naval Reservist (uncredited)
Henry Victor
Baron Ernst von Steuben (U-boat commander)
John Loder
Franz Shiller
Maurice Murphy
Merkel (uncredited)
Nat Pendleton
'Butch' Wagner (uncredited)
Harry Strang
Gunner and drill sergeant (uncredited)
Marion Lessing
Anna Marie Von Steuben
Hans Fuerberg
Fritz Kampf (Second Officer of U-172) (uncredited)
George Harris
Naval Reservist/Swimmer and Diver (uncredited)