Overcoming Barriers - the boundaries of Zones where gravity exceeds the maximum permissible norms many times over - is like going to hell. For a living person of flesh and blood, even equipped with every imaginable implant and external means of protection, such a task is impossible. Almost. Yul Klevtsov, nicknamed Navigator, who led a detachment of combat stalkers from different locations of the Pyatzonya, decided to try. The key to the mystery of the hyperstorm that broke out in the Iron Fields is the mysterious artifact Ouroboros. At least the oldest stalker of the Wasteland, Blind Taras, predicted that with the figurine of a snake biting its tail, Klevtsov would be able to take possession of the pi-wave stabilizer. After all, the one who controls the hyperstorm controls the world!