In the early years of the World War II, the Royal Navy is fighting a desperate battle to keep the Atlantic convoy routes open to supply the British Isles, facing the great danger posed by the many German warships, such as the Admiral Graf Spee, which are scouring the ocean for cargo ships to sink.
John Gregson
as Captain Bell - H.M.S. Exeter
Anthony Quayle
as Commodore Harwood - H.M.S. Ajax
Ian Hunter
as Captain Woodhouse - H.M.S. Ajax
Jack Gwillim
as Captain Parry - H.M.N. Z. S. Achilles
Bernard Lee
as Captain Dove - M.S. Africa Shell
Lionel Murton
as Mike Fowler
Anthony Bushell
as Sir Millington Drake, British Minister, Montevideo
Peter Illing
as Dr. Guani, Foreign Minister, Uruguay
Michael Goodliffe
as Captain McCall, R.N., British Naval Attache, Buenos Aires
Patrick Macnee
as Lieutenant Commander Medley, R.N.
John Chandos
as Dr. Langmann, German Minister, Montevideo
Douglas Wilmer
as M. Desmoulins, French Minister, Montevideo
