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A 1969 plan to build a second, nuke-proof Manhattan below New York City
Damn, but the Cold War made people think BIG. [font size="1"] http://io9.com/5869621/a-1969-plan-to-build-a-second-nuke+proof-manhattan-below-new-york-city [/font]
"The author of this plan speculated on building this spherical city in Manhattan bedrock—a structure which so far as I can determine would have a volume of 1.2 cubic miles (5 km3) with its top beginning some 1,200' under Times Square [...] Newman published this in 1969 (?!) after somehow latching onto the idea of clearing out massive underground caverns with nuclear explosions—in this case, the space would be hollowed out under Manhattan."
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