Once Mutabor, MegaVolt and Saneg13 had decided to visit a famous system of the deep sanitary sewers called Petrogradskaya. The friends had explored a large part of the system, but at the way back Saneg felt himself bad and said that he couldn't go until the manhole. The problem was that the most revision shafts of the sewer didn't have manholes, instead there are some technical openings in their lids closed by heavy concrete slabs. So the explorers had risen until the top of the nearest shaft when they would be able to call their friends. Using car-jacks and crown-bars the "rescue team" had managed to lift a slab and free the prisoners of the sewer (pic 1–7).
Coming back
Later Mutabor had visited the system again together with Mokele and had made some pictures (pic 8–17).