From Wikipedia: The Silent Enemy is a 1958 British action film directed by William Fairchild. It stars Laurence Harvey as Lionel "Buster" Crabb and describes his exploits during World War II. Based on Marshall Pugh's book Commander Crabb, it was made following the publicity created by Crabb's mysterious disappearance and likely death during a Cold War incident a year earlier.
The film depicts events in Gibraltar harbour during the World War II Italian frogman and manned torpedo attacks, although the film's depiction of those events is highly fictionalised.
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