as Cmdr. Richard Bolton, RNVR
as Lt. Davies R.N.V.R
as Sub-Lt. Pennington, RN
as Leading Seaman Quentin
as CPO Barquist X 3
as Lt. Robert Talbot Gogan R.N.R.
as Sub-Lt. Keith Willis, RNVR
as CPO Boker Knowles
as CPO Norman Kennedy
as Leading Seaman X-2
as Leading Seaman X-1
as Capt. Erlich of the 'Lindendorf'
as Vice Admiral Redmayne (uncredited)
as Sub. Lt. X-3