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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
- List of tunnels in the United States - Wikipedia
List of tunnels in the United States 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
- 7 Alabama tunnels you probably didnt know were built beneath your feet
This historic Mobile inn has a gorgeous exterior but it's what you can't see that makes it intriguing: Civil War-era tunnels
- 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
- George Wallace Tunnel - Wikipedia
The George Wallace Tunnel is a pair of road tunnels that carry Interstate 10 through Mobile, Alabama from the city's downtown, going beneath the Mobile River, and emerging on Blakeley Island where they join the Jubilee Parkway over Mobile Bay
- How Tunnels Work - HowStuffWorks
We'll look at the defining characteristics of tunnels and examine how tunnels are built We'll also look at the "Big Dig" in detail to understand the opportunities and challenges inherent to building a tunnel
- The Hidden Tunnels Beneath American Cities—Who Built Them and Why
The hidden tunnels beneath American cities are more than just relics of the past; they are a testament to human ingenuity and the enduring spirit of exploration
- Tunnels: Types and Geological Investigation | Geology
Tunnels may be defined as underground routes or passages driven through the ground without disturbing the overlying soil or rock cover Tunnels are driven for a variety of purposes and are classified accordingly
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