A large underground military facility located in northern China, near the city of Zhangye in Gansu Province. The complex is part of China's extensive network of hardened command and control facilities built during the Cold War era. Situated in a strategic inland location, the site reflects the country's focus on creating resilient military infrastructure capable of withstanding nuclear, biochemical, and conventional attacks.
The region's remote and mountainous terrain provides natural concealment and protection for such installations.