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In the Mediterranean in 1941 the Italians start using underwater chariots to mine the undersides of allied ships. Explosives expert Lionel Crabbe arrives in Gibralter to organise defences, but finds only two British divers available to help him. Even more worrying, it seems likely that the Italians are secretly using neutral Spain across the bay as their key base.
Alan Webb , Alec McCowen , Arnoldo Foà , Brian Oulton , Carlo Giustini , Christopher Cooke , Cyril Shaps , David Lodge , Dawn Addams , Derren Nesbitt , Desmond Jordan , Edward Malin , Ewen Solon , Giacomo Rossi-Stuart , Gianna Maria Canale , Harold Siddons , Howard Marion-Crawford , Hugh Moxey , Ian MacNaughton , Ian Whittaker , Jack May , John Clements , John Lee , John