Commander Bolton
Lt. Davies R.N.V.R
Sub. Lt. Pennington
C.P.O. Barquist
Leading Seaman Quentin
Lt. Gogan R.N.R.
Sub. Lt. Willis R.N.V.R.
C.P.O. Boker Knowles
Sub. Lt. X-3
C.P.O. Kennedy
Leading Seaman X-2
Leading Seaman X-1 (as Nicholas Tate)
Captain Erlich
WRNS Officer (uncredited)
Vice-Adm. Redmayne (uncredited)
German Lieutenant (uncredited)
Cmdr. Steiner (uncredited)
Naval Doctor (uncredited)
Sub-Lieutenant on X-1 (uncredited)
Redmayne's Flag Officer (uncredited)
Captain in Redmayne's Office (uncredited)
