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U.S. Highway 441 Tunnel Northbound, between Gatlinburg and Pigeon Forge and 2 more tunnels in Great Smoky Mountains National Park on Highway 441 between Gatlinburg and Cherokee; Bachmann Tubes, which carry Ringgold Road through Missionary Ridge from Chattanooga into the neighboring town of East Ridge.
In transport, tunnels can be connected together to form a tunnel network.These can be used in mining to reach ore below ground, in cities for underground rapid transit systems, in sewer systems, in warfare to avoid enemy detection or attacks, as maintenance access routes beneath sites with high ground-traffic such as airports and amusement parks, or to extend public living areas or commercial ...
An underground service platform that is supposedly part of Metro-2. In 1991, the United States Department of Defense published a report entitled Military forces in transition, which devoted several pages to a secret government underground in Moscow. It also included a diagram of the system superimposed on a map of the city. [2]
An underground city is a series of linked subterranean spaces that may provide a defensive refuge; a place for living, working or shopping; a transit system; mausolea; wine or storage cellars; cisterns or drainage channels; or several of these. Underground cities may be currently active modern creations or they may be historic including ancient ...
International Underground Railroad Memorial in Windsor, Ontario John Brown participated in the Underground Railroad as an abolitionist. British North America (present-day Canada) was a desirable destination, as its long border gave many points of access, it was farther from slave catchers , and it was beyond the reach of the United States ...
Line 3 is actually 46.5 km long, but only 25.2 km of it are underground. Metro Helsinki metro (Kivenlahti–Sörnäinen) Espoo and Helsinki, Finland 25,200 m (15.659 mi) 1982–2022 Metro Taipei Metro: Orange Line (Huilong – Nanshijiao) Taipei, Taiwan 25,100 m (15.596 mi) (Excl. branch) 1998–2013 Railway Twin Tube Musil Tunnel [38] [39]
Other secret passages have sometimes been added after initial building. Secret tunnels have often been created as escape routes from prisons or prisoner-of-war camps, where they are known as escape tunnels. They typically require a hidden opening or door, and may involve other deceptive construction techniques, such as the creation of a false wall.
The newspapers of the 19th century document tunnels and secret passages underground. Organized crime was the center of many of these stories. [1] [2] However, many of the more colorful stories claimed for the underground are highly dubious. [3]