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 …

Washington, D.C.’s federal architects have a special proclivity for underground tunnels. District residents navigate the tubes like human submarines, and rely on their services for basic needs like drinking …

Dec 19, 2025 · 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 …

15 hours ago · A tractor-trailer caught fire inside the northbound 3rd Street Tunnel in Northwest Washington, forcing a closure Tuesday morning.

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

Tunnels are dug in types of materials varying from soft clay to hard rock.