Moscow Metro-2
Unsurprisingly, the Soviets also planned ahead for a possible nuclear catastrophe. Metro-2 in Moscow, Russia, is a secret, or not so secret, metro system that parallels the public Moscow Metro, but is larger, exceeding that of the normal metro system, and lying deep underground at 50 to 200 meters deep with only 4 lines. Built during the halcyon Stalin days, it was codenamed D-6 by the KGB. There has been much speculation in the last 2 decades as to the existence of Metro-2, but reports from Russian journalists, high government officials, and metro authorities have essentially lain all doubt to rest, not to mention that the Federal Security Service of the Russian Federation (FSB) or the Moscow Metro administration neither confirm nor deny its existence. The secret metro lines connect key government buildings such as the Kremlin with the FSB headquarters, the government airport at Vnukovo-2, an underground town at Ramenki, and other locations of national importance, and house ample living space for politicians and their families. Now all you have to do is find the entrance to the tunnels on your next trip to Moscow.
