 Marlon BrandoRobert Crain | Robert Crain |
 Yul BrynnerCaptain Müller | Captain Müller |
 Janet MargolinEsther | Esther |
 Trevor HowardColonel Statter | Colonel Statter |
 Martin BenrathKruse | Kruse |
 Hans Christian BlechDonkeyman | Donkeyman |
 Wally CoxDr. Ambach | Dr. Ambach |
 Max HauflerBranner | Branner |
 Rainer PenkertMilkereit | Milkereit |
 William RedfieldBaldwin | Baldwin |
 Oscar Beregi Jr.Admiral (as Oscar Beregi) | Admiral (as Oscar Beregi) |
| MMartin BrandtNissen | Nissen |
| CCharles De VriesKurz | Kurz |
 Carl EsmondBusch | Busch |
 Martin KosleckWilke | Wilke |
 Norbert SchillerSteward | Steward |
| RRick TraegerSchultz | Schultz |
 Ivan TriesaultLt. Brandt | Lt. Brandt |
| RRobert SorrellsKoeniger | Koeniger |
 Eric BraedenRadio Officer (uncredited) | Radio Officer (uncredited) |
| FFrank LondonMerchant Marine (uncredited) | Merchant Marine (uncredited) |
 Jim GoodwinMerchant Marine (uncredited) | Merchant Marine (uncredited) |
 Gregg BartonMerchant Marine (uncredited) | Merchant Marine (uncredited) |
 Paul BaxleyCrew Member (uncredited) | Crew Member (uncredited) |
| HHal BokarMerchant Marine (uncredited) | Merchant Marine (uncredited) |
| HHeinz BrinkmannCrew Member (uncredited) | Crew Member (uncredited) |
 Gene DynarskiMerchant Marine (uncredited) | Merchant Marine (uncredited) |
| HHarold DyrenforthCornelson, Ingo Navigator (uncredited) | Cornelson, Ingo Navigator (uncredited) |
 Horst EbersbergCrew Member (uncredited) | Crew Member (uncredited) |
 Fritz FordCrew Member (uncredited) | Crew Member (uncredited) |
