Southern Command decides to send Tarasov, Volentir and two Marines Shvets and Zinoviev to the rear of the northern group of subversive. The saboteurs capture lieutenant colonel Moroshkin from the "Northern" group, who deliberately got framed, having hidden a transmitter on his body. Tarasov unravels the plan, his team gets to the airfield north and selects the secret documents from the northern officer. Lykov pursues the saboteurs on an armored personnel carrier, Volentir blinds the BTR, the car breaks a bridge and falls into the swamp, Volentir is seriously injured by fragments of the bridge. Shvets and Tarasov help the northern to get out of the car, Zinoviev rides on the coast and delivers the documents. The southern go into a victorious offensive.