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  2. Underground Great Wall of China - Wikipedia

    en.wikipedia.org/wiki/Underground_Great_Wall_of...

    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). [1] [2]

  3. Underground City (Beijing) - Wikipedia

    en.wikipedia.org/wiki/Underground_City_(Beijing)

    The Underground City (Chinese: 地下城; pinyin: Dìxià Chéng; Wade–Giles: Ti 4-hsia 4 Chʻêng 2) is a Cold War era bomb shelter consisting of a network of tunnels located beneath Beijing, China. It has also been referred to as the Underground Great Wall since it was built for the purpose of military defense.

  4. Western Wall Tunnel - Wikipedia

    en.wikipedia.org/wiki/Western_Wall_Tunnel

    The tunnel allows access to the remainder of the Wall in a northerly direction. The tunnel is connected to several adjacent excavated underground spaces, many of which can be visited together with the main tunnel. For this reason the plural form, Western Wall Tunnels, is often used.

  5. Chinese engineers digging world's longest tunnel in Xinjiang ...

    www.aol.com/news/chinese-engineers-digging...

    Chinese workers building what would be the world's longest tunnel have come up against an unexpected problem in one of the driest areas on Earth - gushing streams of water. That is according to ...

  6. 816 Nuclear Military Plant - Wikipedia

    en.wikipedia.org/wiki/816_Nuclear_Military_Plant

    In 2010, it was opened to Chinese tourists. It is a distinct network of nuclear-weapons manufacturing tunnels to the likewise defunct Underground Project 131 and the still operational "Underground Great Wall of China."

  7. Hidden underground tunnel system built by Incas found ... - AOL

    www.aol.com/hidden-underground-tunnel-system...

    Researchers used sound testing and a radar to identify the tunnels’ location and reveal that the walls, likely constructed with stone and roofed with carved beams, 1.4 to 2.5 metres beneath the ...

  8. This woman is building a tunnel under her house and ... - AOL

    www.aol.com/news/woman-building-tunnel-under-her...

    A woman on TikTok has gained notoriety for an unusual home improvement project: digging a tunnel that is 30 feet long and 20 feet deep under her suburban home.

  9. List of longest tunnels - Wikipedia

    en.wikipedia.org/wiki/List_of_longest_tunnels

    Longest tunnel of the Central Yunnan Water Diversion Project [93] Railway Twin Tube Mont d'Ambin Base Tunnel: Cottian Alps, France/Italy 57,500 m (35.729 mi) 2032 [94] Part of the Lyon–Turin high-speed railway. Reconnaissance tunnels under construction since 2002; construction of main tunnel started in 2016. [95] Railway Twin Tube Brenner ...