

146 minutes
3/25/1957
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.

Sergei Stolyarov
as Vorontsov

Igor Vladimirov
as Skvoreshnya

Pavel Luspekayev
as Kartsev

Mikhail Gluzskiy
as Ivashev

Sergei Golovanov
as Gorelov, inzhener-mekhanik

Pyotr Sobolevsky
as Druzhinin, assistant commander

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

Antonina Maksimova
as Olga Ivanovna Bystrykh, doctor of the Pioneer submarine

Leonid Pirogov
as Ivan Nikolayevich Bystrykh, father of Olga Bystrykh

Troady Dobrotvorsky
as Vasily Ivanovich Bazov, Colonel of State Security

Pavel Luspekayev
as Kartsev, senior lieutenant of state security

Irina Preis
as Sidorina, administrator of the Intourist hotel in Riga

Igor Bristol
as Pavlik, son of the captain of the ship "Arktika"