John Mills character Lt. Cmdr. Armstrong
Richard Attenborough character Stoker Snipe
Nigel Patrick character Lt. Manson
George Cole character ERA Marks
Bernard Lee character Cmdr. Gates
Peter Hammond character Sub-Lt. Oakley
Andrew Crawford character Sub-Lt. J. McFee
Michael Brennan character CPO Barlow
Frank Coburn character Leading Seaman Brough
Roddy McMillan character Leading Seaman Andrews
Jack Stewart character Leading Seaman Kelly
George Thorpe character Capt. Fenton
Alastair Hunter character Capt. Jenner
