A tunnel is an underground or undersea passageway. It is dug through surrounding soil, earth or rock, or laid under water, and is usually completely enclosed except for the two portals common at each end, though there may be access and ventilation openings at …

Dec 14, 2024 · Busy beavers and merry moles have been chattering about resurfaced plans for a $20 trillion transatlantic tunnel that could theoretically link London and New York in just an hour using vacuum...

The meaning of TUNNEL is a covered passageway; specifically : a horizontal passageway through or under an obstruction. How to use tunnel in a sentence.

Tunnel construction is a subset of underground construction. There are three basic types of tunnel construction in common use: Cut-and-cover tunnel, constructed in a shallow trench and then covered over. Bored tunnel, constructed in situ, without removing the ground above. They are usually of circular or horseshoe cross-section.

TUNNEL definition: 1. a long passage under or through the ground, especially one made by people: 2. the long passage…. Learn more.

tunnels and underground excavations, horizontal underground passageway produced by excavation or occasionally by nature’s action in dissolving a soluble rock, such as limestone. A vertical opening is usually called a shaft.

Tunnels are underground or underwater passages designed to allow transportation through or beneath natural and man-made barriers. Engineers use tunnels in diverse applications, including roads, railways, subways, and water systems.

A tunnel is built for infrastructure like electricity cables, water, communication and sewerage to avoid damage and disruption above ground. Some tunnels are used by prisoners to escape jail . Sometimes tunnels are used by criminals to do a bank robbery (e.g. in Brazil , Summer 2005).

Jan 3, 2025 · The Queens-Midtown Tunnel was opened in 1940 by the New York City Tunnel Authority to relieve traffic congestion on the city's East River bridges. One of the largest public works projects of the New Deal era, it represented the most advanced tunnel engineering techniques of its day. The tunnel became a Triborough facility in 1946, when the New ...

tunnel, Horizontal or nearly horizontal underground or underwater passageway. Tunnels are used for mining, as passageways for trains and motor vehicles, for diverting rivers around damsites, for housing underground installations such as power plants, and for conducting water.