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

Rein Aren

Karl Eggi (uncredited)

Boris Goldayev

Kolka Shmidt's Fellow Villager (uncredited)

Leonid Kanevsky

Italian Radio Operator (uncredited)

Eve Kivi

The Blonde Lady (uncredited)

Galina Mikeladze

Telegraph Operator (uncredited)

Yuriy Nazarov

Anatoliy Alekseev (uncredited)

Paul Scofield

Main Judge (uncredited)

Nikolay Smorchkov

The Seaman (uncredited)

Rogvold Sukhoverko

Ringborg (uncredited)