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- Tunnel - Wikipedia
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 various points along the length
- Tunnels and underground excavations | History, Methods, Uses, Facts . . .
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
- TUNNEL Definition Meaning - Merriam-Webster
The meaning of TUNNEL is a covered passageway; specifically : a horizontal passageway through or under an obstruction How to use tunnel in a sentence
- How Tunnels Work - HowStuffWorks
Constructing a tunnel is one of the most complex challenges in the field of civil engineering Learn about the basics behind tunnels
- Tunnel construction - Wikipedia
Tunnels are dug in types of materials varying from soft clay to hard rock
- List of tunnels in the United States - Wikipedia
The following is a list of some tunnels in the United States of America More tunnels may be found in each state than are included on this list
- Downtown Tunnels | Experience | Downtown Houston
Downtown Tunnels Downtown's "underground" is a system of tunnels 20 feet below Houston's Downtown streets and more than six miles long Starting in the 1930s as a tunnel between two movie theaters, today Downtown's subterranean network connects 95 city blocks and has weekday workday food, shops and services
- TUNNEL | English meaning - Cambridge Dictionary
TUNNEL definition: 1 a long passage under or through the ground, especially one made by people: 2 the long passage… Learn more
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