Peter Finch

Umberto Nobile

Sean Connery

Roald Amundsen

Claudia Cardinale

Valeria

Hardy Krüger

Einar Lundborg

Eduard Martsevich

Finn Malmgren

Nikita Mikhalkov

Boris Chukhnovskiy

Mario Adorf

Giuseppe Biagi

Donatas Banionis

Adalberto Mariano

Massimo Girotti

Giuseppe Romagna Manoja

Yuriy Solomin

Felice Trojani

Otar Koberidze

Natale Cecioni

Boris Khmelnitsky

Alfredo Viglieri

Yuri Vizbor

Frantisek Behounek

Leonid Kanevsky

Italian Radio Operator (uncredited)

Stanislav Khitrov

Radio Operator of Icebreaker 'Krasin' (uncredited)

Irakli Khizanishvili

Pomella (uncredited)

Eve Kivi

The Blonde Lady (uncredited)

Boris Klyuev

The Reporter (uncredited)

Stepan Krylov

The Boatswain (uncredited)

Yuriy Nazarov

Anatoliy Alekseev (uncredited)

Bruno O'Ya

Norwegian Radio Operator (uncredited)

Ernst Romanov

The Polar Explorer (uncredited)

Paul Scofield

Main Judge (uncredited)

Nikolay Smorchkov

The Seaman (uncredited)