: Crabb, played by Laurence Harvey, starts with no diving experience and must rapidly build and train an "Underwater Working Party" with limited resources.
: The film is based on Marshall Pugh’s 1956 book, Commander Crabb . It was produced just two years after the real Lionel Crabb vanished under mysterious circumstances during a Cold War reconnaissance mission for MI6 in 1956. The Silent Enemy(1958)
: The film’s pioneering underwater sequences are widely credited as a major inspiration for Ian Fleming’s James Bond novel (and later film), Thunderball . Key Themes : Crabb, played by Laurence Harvey, starts with