816 Nuclear Military Plant

[1] A military megaproject, the nuclear base is located near what is now suburban Fuling, a municipality in Chongqing, China.

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.

[1] The underground base was designed to be able to tolerate thousands of tons of TNT explosives and 8-magnitude earthquakes.

Largely due to change in the Cold War international situation, the project was cancelled in February 1984.

[3] The base has the “World's Largest Artificial Cave”,[1] which has a height of 79.6 meters, roughly equal to that of a 20-floor building.