An Italian submarine captain tries to navigate his sub through enemy waters while being stalked by a British warship. They both make it to the neutral port of Tangiers where they agree a truce.
| Actor | Role |
|---|---|
 Lilli PalmerLygia da Silva | Lygia da Silva |
 James MasonCaptain Blayne | Captain Blayne |
 Gabriele FerzettiLeonardi | Leonardi |
 Alberto LupoMagri | Magri |
 Valeria FabriziSusanne | Susanne |
 Renato De CarmineGhedini | Ghedini |
 Daniele VargasBrauzzi | Brauzzi |
 Andrew KeirO'Brien | O'Brien |
 Gabriele TintiNot listed | Not listed |
| JJeremy BurnhamNot listed | Not listed |
 Paul MüllerPolice Commander | Police Commander |
 Gianni SolaroAdmiral Mendoza | Admiral Mendoza |
 Andrea ChecchiMicheluzzi | Micheluzzi |
 Geoffrey KeenHodges | Hodges |