(Dark Outpost) 14 American Cities With Crazy Underground Tunnel Systems. Old American cities hide many old secrets, and if you believe National Treasure (yes), then you know there’s cool shit stashed below the sidewalks. You just need to know where to look. Before you do any ill-advised digging, we’ve done it for you.
tunnels
DARPA Engaging in Military Exercises in Underground Tunnel Systems; Signs of Subterranean Conflict?
(Ellen Ioanes) The Defense Advanced Research Projects Agency (DARPA) issued a peculiar request over Twitter on Wednesday, asking for underground tunnels to use for research — as soon as possible.
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Archaeologists Uncover Secret ‘Passage to the Underworld’ at Pyramid of the Moon in Teotihuacan
(Stephen D. Foster Jr.) The mystery surrounding the ancient city of Teotihuacan in Mexico continues to unfold after archaeologists found a hidden tunnel beneath the Pyramid of the Moon that they believe was built to represent the “passage to the underworld.”