A military bunker located near the city of Zhangye, Gansu Province, China, believed to be part of the extensive 'Underground Great Wall of China' tunnel system. This network of tunnels, stretching over 5,000 kilometers, was constructed to store and transport China's intercontinental ballistic missiles (ICBMs). The facility represents a significant component of China's strategic nuclear deterrent infrastructure, designed to enhance survivability and concealment of its missile forces.
The exact location and specific details of this particular bunker remain classified, but it is situated in a region historically significant for military installations.