 He personally supervised many of the underwater sequences.Events in the film had minor differences, for example, the boat "Arthur" that carried the Chariot human torpedoes was named "Ingebord" in the film, and the X-class submarines used in Operation Source in 1943 were numbered X-5, X-6 and X-7, and X-5 was the craft that was lost.The score was by Arthur Benjamin and performed under the direction of Muir Mathieson.