Submarine X-1 (1968)

(Cmdr. Richard Bolton, RNVR)

(Lt. Davies R.N.V.R)

(Sub-Lt. Pennington, RN)

(Leading Seaman Quentin)

(CPO Barquist X 3)

(Lt. Robert Talbot Gogan R.N.R.)

(Sub-Lt. Keith Willis, RNVR)

(CPO Boker Knowles)

(CPO Norman Kennedy)

(Leading Seaman X-2)

(Leading Seaman X-1)

(Capt. Erlich of the 'Lindendorf')

(Vice Admiral Redmayne (uncredited))

(Sub. Lt. X-3)

(WRNS Officer (uncredited))

(Cmdr. Steiner (uncredited))

(German Lieutenant (uncredited))

(Naval Doctor (uncredited))

(Sub-Lieutenant on X-1 (uncredited))

(Seaman in Self-defence Demonstration (uncredited))

(Redmayne's Flag Officer (uncredited))

(Captain in Redmayne's Office (uncredited))