China's rat tribe: Over a million people still live in subterranean tunnels underneath Beijing 50 years after Chairman Mao told them to 'dig deep' to survive the Cold War The underground city, dubbed 'The Dungeon', was constructed in 1969 when the threat of nuclear war was at its peak. 10,000 bunkers were built, and when the nuclear threat never materialised, migrant workers and students were ushered into them to live. The living conditions inside the bunkers are basic, with mold and stagnant air due to the lack of
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