
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.
Vorontsov

Skvoreshnya

Kartsev

Ivashev

Gorelov, inzhener-mekhanik

Druzhinin, assistant commander

Arsen Davidovich Lordkipanidze, professor, ichthyologist

Andrey Nikolaevich, professor, oceanologist
Olga Ivanovna Bystrykh, doctor of the Pioneer submarine

Ivan Nikolayevich Bystrykh, father of Olga Bystrykh

Vasily Ivanovich Bazov, Colonel of State Security

Kartsev, senior lieutenant of state security

Sidorina, administrator of the Intourist hotel in Riga

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