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George O'Brien as Cmdr. Robert 'Bob' Kingsley |
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Marion Lessing as Anna Marie Von Steuben |
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Mona Maris as Fraulein Lolita |
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Walter C. Kelly as Chief Mike 'Guns' Costello |
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Warren Hymer as 'Lug' Kaufman |
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Steve Pendleton as Ens. Richard 'Dick' Cabot (as Gaylord Pendleton) |
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Walter McGrail as Chief Joe Cobb |
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Larry Kent as Lt. 'Mac' McGregor |
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Henry Victor as Baron Ernst von Steuben (U-boat commander) |
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John Loder as Franz Shiller |
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Philip Ahlm as German Chief Petty Officer (uncredited) |
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Al Bennett as Naval Reservist (uncredited) |
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Earl Wayland Bowman as Naval Reservist/Swimmer and Diver (uncredited) |
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Bill Brande as Naval Reservist (uncredited) |
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William Collier Sr. as Mugs O'Flaherty (uncredited) |
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Leonard Davison as Naval Reservist (uncredited) |
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Joseph Depew as Naval Reservist (uncredited) |
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Francis Ford as Eric - Captain of Trawler (uncredited) |
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Robert Ford as Naval Reservist (uncredited) |
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Hans Fuerberg as Fritz Kampf (Second Officer of U-172) (uncredited) |
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Curt Furberg as Hoffman (uncredited) |
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Al Generaux as Naval Reservist (uncredited) |
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Bob Gillette as Naval Reservist (uncredited) |
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George Golden as Naval Reservist (uncredited) |
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Ben Hall as Elmer Harrigan (uncredited) |
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George Harris as Naval Reservist/Swimmer and Diver (uncredited) |
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Bob Kyle as Naval Reservist (uncredited) |
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Jack Martin as Naval Reservist (uncredited) |
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Harry Mount as Bugler on Gun Crew (uncredited) |
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Jack Murphy as Naval Reservist (uncredited) |
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Maurice Murphy as Merkel (uncredited) |
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Bob Nelson as Naval Reservist (uncredited) |
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Edward Peil Jr. as Naval Reservist (uncredited) |
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Nat Pendleton as 'Butch' Wagner (uncredited) |
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Terrance Ray as 'Skits' Reilly (uncredited) |
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Marvin Schecter as Gunner (uncredited) |
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Harry Schultz as German Officer (uncredited) |
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Ferdinand Schumann-Heink as Adolph Brucker (uncredited) |
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Robert Shepherd as Naval Reservist (uncredited) |
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Harry Strang as Gunner and drill sergeant (uncredited) |
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Anton Tell as German Chief Petty Officer (uncredited) |
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George Templeton as Naval Reservist (uncredited) |
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Harry Tenbrook as Winkler (uncredited) |
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T.J.F. von Blankerburg as Naval Reservist/Swimmer and Diver (uncredited) |
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Frank Walton as Naval Reservist/Swimmer and Diver (uncredited) |
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Harry Weil as Levinsky (uncredited) |
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Hans Winterhalder as German Chief Petty Officer (uncredited) |
| Directing | John Ford | Director |
| Writing | Dudley Nichols | Writer |
| Editing | Frank E. Hull | Editor |
| Sound | Peter Brunelli | Original Music Composer |
| Camera | Joseph H. August | Director of Photography |
