Case file · Secret facility (alleged)
The secret city under Mount Yamantau
In 1996 US officials and The New York Times reported a vast underground complex being dug under Mount Yamantau in the southern Urals (Bashkortostan), served by the closed town of Mezhgorye; Russian officials gave shifting explanations, from a mining site to a store for food.
1996 CE · 54.26, 58.10 · status: claim
The account
US congressmen asked why Russia was spending heavily on the site while receiving aid. It became a fixture of doomsday-bunker and 'alien base' speculation. The nearby Kosvinsky mountain is another reported command bunker.
The sceptical view
The site is very likely a government continuity bunker, not anything exotic.