 | Peter Finch als Umberto Nobile |
 | Sean Connery als Roald Amundsen |
 | Claudia Cardinale als Valeria |
 | Hardy Krüger als Einar Lundborg |
 | Eduard Martsevich als Finn Malmgren |
 | Grigori Gaj als Rudolf Samoylovich |
 | Nikita Mikhalkov als Boris Chukhnovskiy |
 | Luigi Vannucchi als Captain Zappi |
 | Mario Adorf als Giuseppe Biagi |
 | Donatas Banionis als Adalberto Mariano |
 | Massimo Girotti als Giuseppe Romagna Manoja |
 | Yuriy Solomin als Felice Trojani |
 | Otar Koberidze als Natale Cecioni |
 | Boris Khmelnitsky als Alfredo Viglieri |
 | Yuri Vizbor als Frantisek Behounek |
 | Nikolay Ivanov als Kolka Shmidt |
 | Vladimir Smirnov als Shelagin |
 | Tengiz Archvadze als Renato Alessandrini (uncredited) |
 | Rein Aren als Karl Eggi (uncredited) |
 | Heinz Braun als Reporter (uncredited) |
 | Anatoliy Bystrov als Rinborg's Neighbor in the Hospital Room (uncredited) |
 | Robert Daglish als The Reporter (uncredited) |
| Feliksas Einas als Amundsen's Servant (uncredited) |
| Roland Engmann als Duty Officer (uncredited) |
 | Boris Goldayev als Kolka Shmidt's Fellow Villager (uncredited) |
 | Leonid Kanevskiy als Italian Radio Operator (uncredited) |
| Viktor Kharitonov als Part-bit (uncredited) |
 | Stanislav Khitrov als Radio Operator of Icebreaker 'Krasin' (uncredited) |
 | Irakli Khizanishvili als Pomella (uncredited) |
 | Eve Kivi als The Blonde Lady (uncredited) |
 | Boris Klyuev als The Reporter (uncredited) |
 | Stepan Krylov als The Boatswain (uncredited) |
| Sergey Madyanov als Part-bit (uncredited) |
 | Vitaliy Matveev als Seeing Off (uncredited) |
 | Galina Mikeladze als Telegraph Operator (uncredited) |
 | Dmitriy Mirgorodskiy als Caratti (uncredited) |
 | Oleg Mokshantsev als Pavel Ponomaryov (uncredited) |
 | Yuriy Nazarov als Anatoliy Alekseev (uncredited) |
 | Bruno O'Ya als Norwegian Radio Operator (uncredited) |
| Yevgeniy Orlov als Mishka (uncredited) |
| Gleb Plaksin als The Reporter (uncredited) |
 | Ernst Romanov als The Polar Explorer (uncredited) |
 | Paul Scofield als Main Judge (uncredited) |
| Aleksey Sezeman als The Reporter (uncredited) |
| Valeriy Sirovskiy als Lago (uncredited) |
 | Nikolay Smorchkov als The Seaman (uncredited) |
 | Rogvold Sukhoverko als Ringborg (uncredited) |
 | Tamara Timofeeva als The Woman in the Crowd of People Seeing Off (uncredited) |
 | Andrei Vertogradov als Radio Operator of 'Citta di Milano' (uncredited) |
| Luidmila Tsvetkova als Part-bit (uncredited) |
 | Aleksandr Yanvaryov als Straube (uncredited) |
| Aleksandra Yozhkina als The Woman in the Crowd of People Seeing Off (uncredited) |
| Mikhail Kalatozov | Director |
| Leonid Kalashnikov | Director of Photography |
| Franco Cristaldi | Producer |
| Fernando Ghia | Associate Producer |
| Victor Freilich | Associate Producer |
| Peter Zinner | Other |
| Aleksandr Zatsepin | Original Music Composer |
| Peter Zinner | Editor |
| John Shirley | Additional Editing |
| Mikhail Fishgoit | Production Design |
| Giancarlo Bartolini Salimbeni | Art Direction |
| David Vinitsky | Art Direction |
| Franco D'Andria | Set Decoration |
| Yuri Ekonomtsev | Set Decoration |
| Natalya Meshkova | Costume Design |
| Maksut Alyautdinov | Makeup Artist |
| Pierantonio Mecacci | Makeup Artist |
| Luciano Vito | Hairstylist |
| Roberto Cuomo | Unit Manager |
| Dima Grizick | Unit Manager |
| Boris Krishtul | Unit Manager |
| Vladimir Maron | Production Manager |
| Paul Maslansky | Executive In Charge Of Production |
| Vittorio Musy Glori | Production Manager |
| Marina Volovich | Assistant Director |
| Valerj Sirovski | Assistant Director |
| Igor Petrov | Other |
| Fabio Ancillai | Sound Mixer |
| Viktor Babushkin | Sound Mixer |
| Tonino Cacciottolo | Sound Editor |
| David Hawkins | Sound Editor |
| David Hildyard | Sound Mixer |
| Alex Neiman | Sound Mixer |
| Fausto Ancillai | Sound Mixer |
| Winston Ryder | Sound Editor |
| Boris Artemyev | Stunts |
| Boris Veselov | Stunts |
| Erick Abramjan | Camera Operator |
| Giancarlo Ceccaglia | Assistant Camera |
| Evgeniy Shvedov | Assistant Camera |
| Wladimir Udinzoff | Assistant Camera |
| Boris Zolin | Assistant Camera |
| Antonio Di Lorenzo | Assistant Editor |
| Angelo Mari | Assistant Editor |
| Ennio De Concini | Screenplay |
| Richard DeLong Adams | Screenplay |
| Robert Bolt | Additional Writing |
| Alberto Cavallone | Additional Writing |
| Mikhail Kalatozov | Additional Writing |
| Ennio Morricone | Original Music Composer |
