"Crab" is a Russian submarine of a new generation. Everything connected with it is surrounded by a veil of the strictest secrecy. And yet, there were dashing thugs who managed to capture the submarine and drive it into the possession of the Colombian drug lord Diego Cortez. In this entire daring and lightning-fast operation, the handwriting of the CIA is clearly visible. A group of marines led by the legendary Shatun is given a task of particular importance - to return the boat.