Historical Background
Nestled deep within the mountains of Fuling District in Chongqing, the 816 Nuclear Military Plant Scenic Area stands as one of China’s most extraordinary relics from the Cold War era. Commissioned in 1966 by the Central Military Commission under the top-secret codename “816,” this massive underground complex was originally designed as a nuclear fuel production base—a critical component of China’s strategic defense during the tense geopolitical climate of the 1960s and 70s. Officially titled the “Atomic Energy Reactor and Chemical Reprocessing Project for Third Front Construction,” it was part of the broader “Third Front” initiative, a nationwide effort to relocate vital industries inland away from potential coastal attacks. Over 60,000 workers, including engineers, soldiers, and technicians, were mobilized to construct this subterranean marvel over an 18-year period, working in near-total secrecy.
Engineering Marvel and Scale
Carved directly into solid granite, the 816 facility is often dubbed the “Underground Great Wall” or the “Three Gorges Within a Mountain.” The complex spans a staggering 104,000 square meters of excavated space, comprising 18 main caverns, over 130 interconnected tunnels, shafts, and auxiliary chambers. Its centerpiece—the main reactor chamber—soars to a height of 79.6 meters (equivalent to a 26-story building), making it one of the largest man-made caves in the world. By 1984, when construction was halted due to shifting national priorities, the project had reached 85% completion on civil engineering and 60% on equipment installation, with a total investment of ¥746 million (in 1980s RMB values). Though never activated for its original purpose, the site remains a testament to China’s industrial ambition and wartime preparedness.
Key Highlights for Visitors
The scenic area now offers immersive access to several historically significant zones. The **102 Element Storage Pool**, featured in CCTV’s acclaimed documentary series *“Remembering: Grassroots Stories,”* covers 1,326 square meters and once housed spent nuclear fuel rods. Equipped with nine water gates and 400 storage positions, this pool exemplifies the precision of Cold War-era nuclear logistics. Nearby, the **Reactor Core Bottom**—accessible via a glass-floored walkway on the third floor—allows visitors to gaze upward at a dense forest of pipes and conduits, evoking the eerie beauty of dormant industrial power. On the ninth floor lies the **Central Control Room**, once the technological heart of the entire complex, where early Chinese mainframe computers coordinated operations across the labyrinthine facility.
Architectural and Aesthetic Appeal
One of the most visually striking areas is the **No. 8 Jinyun Mountain Ecological Loop**, located in the chemical reprocessing zone. Enhanced with atmospheric lighting that accentuates the cavern’s natural contours, this section blends raw geology with human engineering in a way that feels both monumental and mysterious. The interplay of shadow and light creates a surreal ambiance, making it a favorite among photographers and history buffs alike. Meanwhile, the **104 Nuclear Power Generation Hall**—31.2 meters tall and 25 meters wide—showcases China’s dual-use nuclear strategy: prioritizing weapons-grade material production while harnessing excess heat for civilian electricity generation.
Visitor Experience and Accessibility
Since its declassification and conversion into a public attraction, the 816 site has been carefully preserved and thoughtfully curated for educational tourism. Guided tours (available in Mandarin, with limited English materials) lead guests through temperature-controlled tunnels that remain cool year-round—a welcome respite in Chongqing’s humid subtropical climate. Interactive exhibits, archival footage, and scale models help contextualize the site’s historical significance without compromising its solemn atmosphere. Families particularly appreciate the attraction’s blend of adventure and learning, which explains its ranking as No. 3 on Chongqing’s Top Family-Friendly Attractions list.
Cultural Significance
Beyond its military function, the 816 Plant symbolizes the resilience and sacrifice of an entire generation who labored anonymously for national security. Many former workers have returned as volunteer docents, sharing personal anecdotes that humanize this otherwise imposing structure. Today, the site serves not only as a museum of Cold War history but also as a monument to China’s rapid industrialization and the hidden costs of geopolitical rivalry. Its nickname—“the He Shi Bi buried deep in the mountain” (referencing a legendary uncut jade)—captures its dual identity: a concealed treasure of both strategic and cultural value.