A group of combat swimmers under the command of Senior Lieutenant Katkov, nicknamed Skat, is looking for a corrupt official from Rosvooruzhenie who has fled to Japan. This official took top secret documents from Russia - compromising evidence on his high-ranking patrons. He is an important witness, and he must be brought home alive. At the same time, the official is also being hunted by hired bandits, who, on the orders of these highest-ranking patrons, must eliminate both him and the incriminating evidence. The forces are initially equal, but the bandits take Taiwanese criminals as allies, and the matter may well end in failure for Skat's group...