A military bunker located near Shenzhen, China, in the Guangdong Province. Shenzhen is a major city in southern China known for its rapid development and strategic importance. While specific details about this bunker are not provided in the search results, the region has a history of military installations and defense structures, particularly from the Cold War era.
The search results mention the Underground Great Wall of China, a network of tunnels used for military defense and storage of intercontinental ballistic missiles, which highlights the significance of underground military infrastructure in China during this period.