Metro-2 is the informal name for a purported secret underground metro system which parallels the public Moscow Metro. The system was supposedly built, or at least started, during the time of Joseph Stalin and was codenamed D-6 (Д-6) by the KGB. It is supposedly still operated by the Main Directorate of Special Programmes and Ministry of Defence.
Supposedly a tunnel switch that leads to Metro-1 from Metro-2, actually a switch at Troparovo to a buffer stop, on Metro-1.
A shaft R6 of OAO "TransInzhStroy" in Ramenki
A hermetic gate in a deep single track tunnel that separates Metro-1 from Metro-2, which was built after transferring this tunnel to KGB
An underground service platform that is supposedly part of Metro-2
Urban exploration is the exploration of manmade structures, usually abandoned ruins or hidden components of the manmade environment. Photography and historical interest/documentation are heavily featured in the hobby, sometimes involving trespassing onto private property. Urban exploration is also called draining, urban spelunking, urban rock climbing, urban caving, building hacking, or mousing.
Abandoned Salbert fortifications
Urban explorers at the entrance of a technical gallery under construction in Paris, France
Željava underground military airport
Light painting inside an abandoned limestone quarry in France.
