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{ "title": "Underground Great Wall of China", "description": "The Underground Great Wall of China is a vast network of tunnels and storage facilities spanning approximately 3,000 miles (5,000km) beneath northern China. This covert infrastructure, often referred to as the Dìxià Chángchéng, was developed to safeguard and deploy intercontinental ballistic missiles (ICBMs) as part of China’s strategic defense capabilities. Unlike the iconic above-ground Great Wall, this subterranean system reflects Cold War-era military planning and remains a critical component of China’s nuclear deterrence strategy.\n\n Constructed during the late 20th century, the tunnels were designed to protect missile silos and command centers from potential aerial or nuclear strikes. The system integrates