 Robert MitchumCapt. Murrell | Capt. Murrell |
 Curd JürgensKapitän von Stolberg | Kapitän von Stolberg |
 David HedisonLt. Ware | Lt. Ware |
 Theodore BikelHeinie Schwaffer | Heinie Schwaffer |
 Russell CollinsDoctor | Doctor |
 Kurt KreugerVon Holem (uncredited) | Von Holem (uncredited) |
 Frank AlbertsonLt. J.G. Crain | Lt. J.G. Crain |
 Biff ElliotQuartermaster | Quartermaster |
 Michael McHaleGerman Soldier | German Soldier |
 Alan DexterLt. Mackeson (uncredited) | Lt. Mackeson (uncredited) |
| JJoe Di RedaBMSN Robbins (uncredited) | BMSN Robbins (uncredited) |
| RRobert BoonChief Engineer | Chief Engineer |
 Doug McClureEns. Merry (uncredited) | Ens. Merry (uncredited) |
 Joe BrooksGerman Soldier (uncredited) | German Soldier (uncredited) |
| GGeorge FordOfficer (uncredited) | Officer (uncredited) |
| SSasha HardenGerman Sailor | German Sailor |
 Ralph ManzaLt. Bonelli (uncredited) | Lt. Bonelli (uncredited) |
 Gordon MitchellGerman Sailor | German Sailor |
| MMarco LópezSoldier (uncredited) | Soldier (uncredited) |
| VVince Deadrick Sr.American Sailor (uncredited) | American Sailor (uncredited) |
| HHans MoebusSailor (uncredited) | Sailor (uncredited) |
| RRalph ReedFireman (uncredited) | Fireman (uncredited) |
