Submarine X-1

James Caan

Cmdr. Richard Bolton, RNVR

David Sumner

Lt. Davies R.N.V.R

Norman Bowler

Sub-Lt. Pennington, RN

Paul Young

Leading Seaman Quentin

Brian Grellis

CPO Barquist X 3

William Dysart

Lt. Robert Talbot Gogan R.N.R.

John Kelland

Sub-Lt. Keith Willis, RNVR

Kenneth Farrington

CPO Boker Knowles

Carl Rigg

CPO Norman Kennedy

Steve Kirby

Leading Seaman X-2

Nick Tate

Leading Seaman X-1

George Pravda

Capt. Erlich of the 'Lindendorf'

Rupert Davies

Vice Admiral Redmayne (uncredited)

Keith Alexander

Sub. Lt. X-3

Diana Beevers

WRNS Officer (uncredited)

Paul Hansard

Cmdr. Steiner (uncredited)

Luke Hanson

German Lieutenant (uncredited)

Desmond Jordan

Naval Doctor (uncredited)

Dennis Mayers

Sub-Lieutenant on X-1 (uncredited)

Doug Robinson

Seaman in Self-defence Demonstration (uncredited)

George Roubicek

Redmayne's Flag Officer (uncredited)

Richard Steele

Captain in Redmayne's Office (uncredited)

William A. Graham

Director

John C. Champion

Story

Edmund H. North

Story

Donald S. Sanford

Screenplay

Guy Elmes

Screenplay

John C. Champion

Producer

Paul Beeson

Director of Photography

Ron Goodwin

Original Music Composer