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
Lana Morris
as
Victor Maddern
as
