
The enemy agents from an unknown nation have secret automated facilities set up in the Atlantic and Pacific oceans for the purposes of sinking ships. The super submarine "Pioneer" and it's intrepid crew is dispatched to find the source of these mysterious sinking's...Unknown to the captain, his chief engineer is working for the bad guys, intent on stopping their efforts, at any cost...It seems the real chief had a twin brother who was a circus acrobat who murdered and replaced him.
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Sergey Stolyarov
Vorontsov

Igor Vladimirov
Skvoreshnya

Pavel Luspekayev
Kartsev, senior lieutenant of state security

Mikhail Gluzskiy
Ivashev

Sergei Golovanov
Gorelov, inzhener-mekhanik

Pyotr Sobolevsky
Druzhinin, assistant commander

Vakhtang Ninua
Arsen Davidovich Lordkipanidze, professor, ichthyologist
Sergei Komarov
Andrey Nikolaevich, professor, oceanologist

Antonina Maksimova
Olga Ivanovna Bystrykh, doctor of the Pioneer submarine

Leonid Pirogov
Ivan Nikolayevich Bystrykh, father of Olga Bystrykh

Troady Dobrotvorsky
Vasily Ivanovich Bazov, Colonel of State Security

Irina Preis
Sidorina, administrator of the Intourist hotel in Riga
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