Peter Finch as Jan Smit

Eva Bartok as Anna

Tony Britton as Major Dillon

Alexander Knox as Walter Keyser

Malcolm Keen as Johan Smit

Christopher Rhodes as Alex

Alfred Burke as Dealer

Melvyn Hayes as Willem

John Horsley as Commander Bowerman

Tim Turner as Dutch Lieutenant

John Le Mesurier as Colonel Janssen

Petra Davies as Menschi

Peter Swanwick as Peter

Carl Jaffe as Diamond Merchant

Karl Stepanek as Diamond Merchant

Oscar Quitak as Diamond Merchant

Keith Pyott as Diamond Merchant

George Pravda as Portmaster

Frederick Schiller as Tugmaster

John Bailey as Port Police Officer

Steve Plytas as Bar Owner