Metro-2, Russia

In Moscow, under the network of busy city streets, there is a complex system of underground transport communications under the secret name D6. The secret metro line was built during the reign of Stalin. It passes at a depth of 210 meters - greater than the depth of a usual operating metro. According to some reports, the secret metro connects several important governmental and administrative institutions, including the Kremlin, the General Staff Academy, Zheltovsky's house and Vnukovo-2 airport.

For a number of assumptions, the purpose of bunkers is not limited by only transport purposes. A complex system of underground tunnels includes fully equipped apartments for living, as well as many technical rooms. According to modern researchers, Metro-2 was built as a shelter in the event of war, intended as a shelter for government officials. Another interesting feature of the secret metro is a construction of its rails, which have been drowned in concrete. This design allows one to drive through tunnels by car.

With what intensity and for what purposes a complex system of underground communications has been used for dozens of years, and whether it continues to be used today - one can only guess. To get to the territory of tunnels a few decades ago, could only people with a special pass. In recent years, many previously unknown bunkers have been found in the Moscow region, according to some researchers, they can be directly related to the complex Metro-2 system. Next - Area 51