This is a story of the Battle of the Atlantic, the story of the ocean, two ships, and a handful of men.
The men are the heroes; the heroines the ships. The only villain is the sea, the cruel sea, that man has made more cruel...

It is a strikingly accurate portrayal of the war between the Royal Navy and Germany's U-boats
from the viewpoint of the British naval officers and seamen who served in escort vessels
during World War II, although the screenplay omitted some of the author Nicholas Monsarrat's grimmest images.

Starring Jack Hawkins and Donald Sinden, with Denholm Elliott, Stanley Baker, Virginia McKenna and Moira Lister.

http://youtu.be/eoQOyhB1ppk