Semyon Merzin, head of the Ferra corporation, is ready to cooperate with terrorists for the sake of money. He helped them sink a barge with radioactive ore in the Bahriyar Republic in order to then blow up the ship. This would not only lead to an environmental disaster, but would also deprive Russia of access to the oil fields of the area. But Merzin doesn't care about the dire consequences; the main thing is to get the money and provide yourself with an iron-clad alibi. And everything would have turned out this way if not for the most experienced “sea devils” Viking and Student, who were sent to a dangerous area to deal with the sunken ship...