Sprawling, fictionalised biopic about Lionel Crabb, an underwater bomb disposal specialist based in Gibraltar in World War II. With his team of expert skin-divers his mission was to continually clear the docks of mines planted by a crack squad of Italians with superior technology, based across the straits in Spain.
Laurence Harvey plays the naval lieutenant as a determined egotist with a prodigious work ethic. Michael Craig is excellent, but barely recognisable, as Crabb's top diver. Unfortunately, the earlier episodes are padded out with clumsy banter, mostly issued by Sidney James as the group's trainer and jack of all trades.
But the film is invigorated by some excellent underwater action in the later scenes, particularly a stand-out knife fight between Crabb and his Italian counterparts in the submerged wreckage of a plane crash. Or by the stuntmen anyway.
With the personal duel of wits against a foreign nemesis operating from an underground HQ, some continental glamour, the array of gadgets, Harvey's aristocratic sneer and the abundant comic relief, this looks like a budget prototype for the James Bond series. There isn't as much style, or colour, but it's still an exciting action film.