In Dagestan one may find such a wonder - a shaft-sinking and tunnelling complex Robbins (USA) that overcame 5 km in the mountains?! It used to be a diversion tunnel 5,2 km long from the dam to the station. Water went
through the generator producing electricity. It was done for elevation changes for bigger station power. The first machine of such type in Russia was exactly here, at Irganaiskaya hydrostation.
In May, 15, 1935 the first trains began to operate in Moscow. They started from the depot "Severnoye" ("Northern"), the first depot of the Moscow metropolitan. It has been serving the metro passengers for 77 years already. The big
territory on Krasnoprudnaya street is the whole metro agglomeration: apart from the depot there are an escalator repair plant, a metro fire department, a motor depot, police department and some other services there.