Reconnaissance divers, combat swimmers, underwater saboteurs, “living torpedoes”, “frog people”, “seals” - they are called differently, depending on the historical period, location or nature of the tasks performed. We know little about them, but at all times these people are rightfully considered the best of the best, the elite of the special forces of any self-respecting state. Combat swimmers are distinguished by the highest professionalism and an impenetrable veil of secrecy, behind which their hard manly work is hidden. A. Chikin’s book tells about the history of the origins of combat underwater diving, its yesterday and today.