816 Nuclear Military Plant
816 Nuclear Military Plant (simplified Chinese: 816地下核工厂; traditional Chinese: 816地下核工廠), is a Chinese underground nuclear base, and the largest in the world. A military megaproject, The nuclear base is located in what is now suburban Chongqing, a municipality in Southwest China, in the 2000s it was opened to tourists. It is a distinct network of nuclear-warfare supporting tunnels to the likewise defunct Underground Project 131 and the still operational, "Underground Great Wall of China."
The base has the “World's Largest Artificial Cave”. The project was started in 1966 when Sino-Soviet relations dramatically declined (see also the Sino-Soviet split). To enhance China's national defence and prevent possible Soviet invasion and nuclear attack, the project was approved (directly by then-Premier Zhou Enlai) and undertaken in secret. More than 60,000 engineering soldiers of the People's Liberation Army participated in the construction of the base. The underground base was designed to be able to tolerate thousands of tons of TNT explosives and 8-magnitude earthquakes.
The surface area of the cave is more than 104,000 m2, and the total length of the tunnels is more than 20 kilometers. The whole complex has a total of 18 artificial caves linked to each other, and has more than 130 roads and tunnels. Automobiles such as cars are able to pass the roads and tunnels inside. The largest artificial cave has a height of 79.6 meters, and is roughly equal to that of a 20-floor building.
The project was under construction for 17 years, and the construction was nearly completed in 1984. Largely due to change in the Cold War international situation, the project was cancelled in February 1984. It was further declassified in April 2002. In April 2010, after 40 years of closure, the base was opened to tourists.
- "Former nuclear plant opening as tourist attraction". China Daily. 2010-04-13. Archived from the original on 16 April 2010. Retrieved 23 May 2010.
- 图集：重庆地下核工厂首次作为旅游景点开放 (in Chinese). Tencent QQ News. 2010-04-26. Archived from the original on 29 April 2010. Retrieved 23 May 2010.
- Christina Wang (April 28, 2010). "Chongqing 816 Nuclear Defense Cave Will Open to the Public". www.prlog.org. Retrieved 23 May 2010.
- Pictures of the 816 Nuclear Military Plant (Chinese)
- CCTV: Chongqing opens former Nuclear Plant as tourist attraction