Work on the plant began in 1966 as tension between China and Soviet Union. 816 plant, built to withstand up to 8.0-magnitude earthquakes, has 18 main caverns (the largest of which is 80 meters high) and 21 kms of tunnels and passageways. The project was never finished after a 740 millions of RMB investment and the work stopped in 1984. The plant opened to domestic tourists in April 2010. Inside you can find a retrofuturist Chinese computer from the seventies.