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Can they be built surreptitiously? Sure under an urban center with 10 billion people, and just 1,000 feet deep too.
If/when TSHTF all you guys close to DIA should rush the place with guns and take over the facility..
I doubt there is any system a thousand feet down, though it would be an interesting google search to find the deepest subway system. A quick search shows St. Petersberg at 105 meters. Impressive engineering!
Originally posted by plexus
Yeah, smoking some of that good sh*t.
Thanks for the overwhelmingly informative response.
edit on 23-1-2011 by plexus because: additional information added