Slobodan Kosovalić

About young graduates of the maritime academy and their first voyage at sea. About the difficult test of professional and human endurance that had to be endured by both the crew of the trawler "Kaira," which suffered a disaster during a storm, and the crew of the rescue ship Poseidon under the command of Captain Chigrinov, where the film's hero, Slavka Chigrinov, served, demonstrating resourcefulness, courage, and bravery in times of danger.

The film is based on real events that took place in Samara - the counter-revolutionary conspiracy of 1921. The Samara GubChK brilliantly exposes the counter-revolutionary bandit conspiracy against the Soviet government. The main characters are real people. Levin, the chairman of the Cheka, was originally named Byrne and was later repressed in the 1930s.