Underground Great Wall of China

The Underground Great Wall of China (Chinese: 地下长城; pinyin: Dìxià Chángchéng) is the informal name for the 3,000 mile (5,000km) system of tunnels used by China to store and transport intercontinental ballistic missiles (ICBMs). == Description == Due to the great secrecy surrounding the tunnels, little information about them is publicly available.