
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.

as Vorontsov

as Skvoreshnya

as Kartsev

as Ivashev

as Gorelov, inzhener-mekhanik

as Druzhinin, assistant commander

as Arsen Davidovich Lordkipanidze, professor, ichthyologist

as Andrey Nikolaevich, professor, oceanologist

as Olga Ivanovna Bystrykh, doctor of the Pioneer submarine

as Ivan Nikolayevich Bystrykh, father of Olga Bystrykh

as Vasily Ivanovich Bazov, Colonel of State Security

as Kartsev, senior lieutenant of state security

as Sidorina, administrator of the Intourist hotel in Riga

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