Ericson

Jack Hawkins

Lockhart

Donald Sinden

Morell

Denholm Elliott

Ferraby

John Stratton

Bennett

Stanley Baker

Baker

John Warner

Watts

Liam Redmond

Tallow

Bruce Seton

Yeoman Wells

Meredith Edwards

Julie Hallam

Virginia McKenna

Elaine Morell

Moira Lister

Raikes

Barry Letts

Doris Ferraby

June Thorburn

Polish Captain

Gerard Heinz

Tallow's Sister

Megs Jenkins

Gracey

Fred Griffiths

Phillips

Glyn Houston

Tonbridge

Alec McCowen

Wainwright

Leo Phillips

Signalman Rose

Dafydd Havard

Sellars

Laurence Hardy

Carslake

Sam Kydd

Gray

John Singer

Broughton

Barry Steele

Norwegian Captain

Gerik Schjelderup

French Captain

Gaston Richer

Scott Brown

Andrew Cruickshank

Allingham

Kenn Kennedy

Asdic Operator

Harold Goodwin

Admiral at Party

George Curzon

R.N. Lieutenant

Anthony Snell

R.N. Captain

Ronald Simpson

Lieutenant Commander

Don Sharp

The Waiter

Herbert C. Walton

A Survivor

Jack Howard

A.R.P. Warden

Russell Waters

A.R.P. Warden

Harold Jamieson

Petty Officer Instructor

Warwick Ashton

Gray

Jonathan Singer

Warden (uncredited)

Walter Fitzgerald

Sonar Operator (uncredited)

Paddy Joyce

Sailor (uncredited)

Richard Leech

Sailor in Water

Jim O'Brady

Sailor in Water

Jim Brady

Admiral Murray-Forbes (uncredited)

Alan Webb