Graybags said:Strange choice, but true
The Silent Enemy (1958)
Based in Gibraltar, the story of "Buster" Crabbe
One of the things that makes it endearing to me is that the Jolly jack tars live in a cave down below Parson's Lodge battery
If you haven't seen it, it crops up on TV very occasionally
Is that the one where Sid James plays the hard as nails Petty Officer?