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 …

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 …

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

Constructing a tunnel is one of the most complex challenges in the field of civil engineering. Learn about the basics behind tunnels.

Dec 4, 2025 · Contrary to showing only advanced tunneling technology, these tunnels are a hallmark of mankind’s ability to build structures that overcome geographical barriers. Modern tunnel construction...

TUNNEL definition: an underground passage. See examples of tunnel used in a sentence.

Tunnel Hill, Georgia, is a small town steeped in rich Civil War history, most notably recognized for the Western and Atlantic Railroad Tunnel. This engineering marvel, completed in 1850, played a pivotal …