The book, dedicated to the mysterious pages of the Second World War, describes combat operations at sea, in which human-controlled torpedoes, exploding boats and demolition charges were used, attached to the hull of an enemy ship by specially trained swimmers - saboteurs. The book includes the memoirs of V. Borghese, who talks about the use of these military means by the Italians, as well as a story about him by P. Desmarais.