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Laurence Harvey as Lieutenant "Buster" Crabb, R.N.V.R. |
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Michael Craig as Leading Seaman Knowles |
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Dawn Addams as Third Officer Jill Masters, W.R.N.S |
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John Clements as The Admiral |
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Sidney James as Chief Petty Officer Thorpe |
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Alec McCowen as Able Seaman Morgan |
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Nigel Stock as Able Seaman Fraser |
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Ian Whittaker as Ordinary Seaman Thomas |
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Arnoldo Foà as Tomolino |
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Gianna Maria Canale as Conchita |
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Massimo Serato as Forzenelli |
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Giacomo Rossi Stuart as Rosati |
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Carlo Giustini as Fellini |
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Raymond Young as Celloni |
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David Lodge as Sergeant |
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Ewen Solon as Willowdale Captain |
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Brian Oulton as Holford |
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Howard Marion-Crawford as Wing Commander |
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Cyril Shaps as Miguel |
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Lee Montague as Miguel's Mate |
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John Lee as Flag Lt. |
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Terence Longdon as Lt Bailey |
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Ian MacNaughton as Admiralty Sentry |
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Alan Webb as British Consul |
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John Moffatt as Diver |
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Harold Siddons as Army Interrogation Officer |
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Michael Brill as Naval Interrogation Officer |
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Jack May as Navy Doctor |
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Derren Nesbitt as Patrol Boat Officer |
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Yvonne Romain as Spanish Girl |
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Jerome Willis as Sailor |
| Directing | William Fairchild | Director |
| Writing | William Fairchild | Screenplay |
| Writing | Marshall Pugh | Novel |
| Production | Bertram Ostrer | Producer |
| Sound | William Alwyn | Music |
| Crew | Otto Heller | Cinematography |
| Editing | Alan Osbiston | Editor |
| Camera | Ray Hearne | Still Photographer |
