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Inside a top secret underground Cold War nuclear facility in Chongqing, China

International Business Times Logo By David Sim of International Business Times | Slide 1 of 20: The world's largest artificial cave was designed to withstand thousands of tons of explosives and 8-magnitude earthquakes, as well as atomic and hydrogen bombs.

Inside a top secret Cold War nuclear facility in China

The world's largest artificial cave was designed to withstand thousands of tons of explosives and 8-magnitude earthquakes, as well as atomic and hydrogen bombs.
© Wang Zhao/AFP
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