Peter Finch as Umberto Nobile

Sean Connery as Roald Amundsen

Claudia Cardinale as Valeria

Hardy Krüger as Einar Lundborg

Eduard Martsevich as Finn Malmgren

Grigori Gaj as Rudolf Samoylovich

Nikita Mikhalkov as Boris Chukhnovskiy

Luigi Vannucchi as Captain Zappi

Mario Adorf as Giuseppe Biagi

Donatas Banionis as Adalberto Mariano

Massimo Girotti as Giuseppe Romagna Manoja

Yuriy Solomin as Felice Trojani

Otar Koberidze as Natale Cecioni

Boris Khmelnitsky as Alfredo Viglieri

Yuri Vizbor as Frantisek Behounek

Nikolay Ivanov as Kolka Shmidt

Vladimir Smirnov as Shelagin

Tengiz Archvadze as Renato Alessandrini (uncredited)

Rein Aren as Karl Eggi (uncredited)

Heinz Braun as Reporter (uncredited)

Anatoliy Bystrov as Rinborg's Neighbor in the Hospital Room (uncredited)

Robert Daglish as The Reporter (uncredited)

Feliksas Einas as Amundsen's Servant (uncredited)

Roland Engmann as Duty Officer (uncredited)

Boris Goldayev as Kolka Shmidt's Fellow Villager (uncredited)

Leonid Kanevsky as Italian Radio Operator (uncredited)

Viktor Kharitonov as Part-bit (uncredited)

Stanislav Khitrov as Radio Operator of Icebreaker 'Krasin' (uncredited)

Irakli Khizanishvili as Pomella (uncredited)

Eve Kivi as The Blonde Lady (uncredited)

Boris Klyuev as The Reporter (uncredited)

Stepan Krylov as The Boatswain (uncredited)

Vitaliy Matveyev as Seeing Off (uncredited)

Sergey Madyanov as Part-bit (uncredited)

Galina Mikeladze as Telegraph Operator (uncredited)

Dmitriy Mirgorodskiy as Caratti (uncredited)

Oleg Mokshantsev as Pavel Ponomaryov (uncredited)

Yuriy Nazarov as Anatoliy Alekseev (uncredited)

Bruno O'Ya as Norwegian Radio Operator (uncredited)

Yevgeniy Orlov as Mishka (uncredited)

Gleb Plaksin as The Reporter (uncredited)

Ernst Romanov as The Polar Explorer (uncredited)

Paul Scofield as Main Judge (uncredited)

Aleksey Sezeman as The Reporter (uncredited)

Valeriy Sirovskiy as Lago (uncredited)

Nikolay Smorchkov as The Seaman (uncredited)

Rogvold Sukhoverko as Ringborg (uncredited)

Tamara Timofeeva as The Woman in the Crowd of People Seeing Off (uncredited)

Andrei Vertogradov as Radio Operator of 'Citta di Milano' (uncredited)

Luidmila Tsvetkova as Part-bit (uncredited)

Aleksandr Yanvaryov as Straube (uncredited)

Aleksandra Yozhkina as The Woman in the Crowd of People Seeing Off (uncredited)