Fri, 2018-Sep-28 01:51 UTC
Length - 1:57
Welcome to popular Wiki of the Day where we read the summary of a popular Wikipedia page every day.
With 681,171 views on Thursday, 27 September 2018 our article of the day is Tunnel.
A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods.
A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. The central portions of a rapid transit network are usually in tunnel. Some tunnels are aqueducts to supply water for consumption or for hydroelectric stations or are sewers. Utility tunnels are used for routing steam, chilled water, electrical power or telecommunication cables, as well as connecting buildings for convenient passage of people and equipment.
Secret tunnels are built for military purposes, or by civilians for smuggling of weapons, contraband, or people. Special tunnels, such as wildlife crossings, are built to allow wildlife to cross human-made barriers safely. Tunnels can be connected together in tunnel networks.
This recording reflects the Wikipedia text as of 01:51 UTC on Friday, 28 September 2018.
For the full current version of the article, go to http://en.wikipedia.org/wiki/Tunnel.
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