On a certain remote island within the country, there is a prison zone where inmates are forced to mine ore. In one of the island’s caves, dinosaur bones are discovered. A sophisticated lady from the capital is invited to study the find, and a brave local guard, Sergeant A. Peskov, is assigned to escort her. Meanwhile, a ruthless crime boss known by the fearsome nickname "Scorpion," along with a group of hardened convicts, is secretly plotting an escape from the zone...