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Cmdr. Richard Bolton, RNVR
David Sumner
Lt. Davies R.N.V.R
Brian Grellis
CPO Barquist X 3
George Roubicek
Redmayne's Flag Officer (uncredited)
John Kelland
Sub-Lt. Keith Willis, RNVR
Nick Tate
Leading Seaman X-1
Norman Bowler
Sub-Lt. Pennington, RN
William Dysart
Lt. Robert Talbot Gogan R.N.R.
Carl Rigg
CPO Norman Kennedy
Rupert Davies
Vice Admiral Redmayne (uncredited)
Paul Young
Leading Seaman Quentin
Kenneth Farrington
CPO Boker Knowles
George Pravda
Capt. Erlich of the 'Lindendorf'
Paul Hansard
Cmdr. Steiner (uncredited)