The crew of a submarine is trapped on the sea floor when it sinks. How can they be rescued before they run out of air?

John Mills
as Lt. Cmdr. Armstrong

Richard Attenborough
as Stoker Snipe

Nigel Patrick
as Lt. Manson

George Cole
as ERA Marks

Bernard Lee
as Cmdr. Gates

Peter Hammond
as Sub-Lt. Oakley

Andrew Crawford
as Sub-Lt. J. McFee

Michael Brennan
as CPO Barlow

Wylie Watson
as

Helen Cherry
as
CinemaSerf
This is quite an anxious wartime drama that goes some way to illustrating the perils faced by those in HM Submarine Service. John Mills is the captain "Armstrong" who takes his crew on a routine maritime patrol only for their gear to become ensnared in a mine cable. A suddens stop and reverse engine...