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Under Moscow/Russia there would be LOTS of stuff, but the only public ones I found anymore are just some partypics. They tend to be a little secretive the folks there
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This particular one is in the outskirts of Moscow.

More photo of the place (with outdoor pictures) here :

http://barrier.marshruty.ru/Photos/Photo...aa9f92c5e7

There is a famous river buried under the Moscow and Kremlin : Neglinka, and indeed many others underground networks.