Climb the bridge and jump into the open hatch on the roof. To do this, go along the railway tracks South until you reach the abandoned train bridge. A set of tools for Nitrogen Going to the location of Jupiter will also have to find instruments for the local technician named Nitrogen. In exchange for food, the mercenaries will allow you to dig in the containers in the back yard of the substation, where, after a brief search, you'll find another set of tools. Agree with them, promising to bring food. Approaching her, you stay away from terrible shout back at her mercenaries. You must then visit the substation to the West of anomaly 'Circus'. When those scattered by the explosion, come down and run as fast as possible. Throw them in the cracks on the floor in a cluster of dead stalkers. Cracked in the attic boxes and pull out a grenade. Zombified stalkers the whole bunch will gather on the shots and block the passage, preventing the player to go inaccurate, but heavy fire. However, to go from the attic is not so easy. Each of the technicians need 3 kinds of tools: tools for rough work, tools for fine work and tools for calibration.