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