Retired swimmer-saboteur Kostya Kudinov cannot sit idle. And when an oligarch he knew invited him to take part in the search for an English sailing ship with gold that sank many years ago in the Black Sea, Kostya happily agreed. But it turned out that there are many hunters for the coveted prey: both militants of the Chinese mafia and a detachment of elite combat swimmers of the US Navy. How could a “simple” Russian guy be against them! True, the guy is equally fluent in all known close combat techniques both on land and under water. So we'll see who gets the gold.