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Underground Service Alert; Utility tunnel – an alternative method of routing underground utility lines and services; Cable locator – an instrument used for detecting the presence and approximate location of buried services; Utility repair tag – a color-coded tag to identify pavement restorer that sometime has a secondary purpose for ...
Underground Service Alert (USA) is a non-profit mutual benefit organization that links the excavation community and the owners of underground lines. Underground Service Alert has two separate call centers for California : Underground Service Alert of Northern California (USA North) and Underground Service Alert of Southern California (USA South ...
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Borehole radars utilizing GPR are used to map the structures from a borehole in underground mining applications. Modern directional borehole radar systems are able to produce three-dimensional images from measurements in a single borehole. [8] One of the other main applications for ground-penetrating radars is for locating underground utilities.
By 2006, SafeView's body scanning portals had been installed and trialed at various locations around the globe. They were installed at border crossings in Israel, international airports such as Mexico City and Amsterdam's Schiphol, ferry landings in Singapore, railway stations in the UK, government buildings like The Hague, and commercial ...
A three-dimensional muography experiment was done in the underground tunnels of Mt Echia (in Naples, Italy) with 2 muon detectors, MU-RAY and MIMA, which successfully imaged 2 known cavities and discovered one unknown cavity. Mt Echia is where the earliest Naples settlement started in the 8th century and is located underground.
The interior of SubTropolis. SubTropolis is a business complex located inside of a 55,000,000-square-foot (5,100,000 m 2), 1,260-acre (5.1 km 2) mine in the bluffs north of the Missouri River in Kansas City, Missouri, United States.
Aug. 11—An estimated 100,000 slaves sought freedom in the 1800s through a network of supporters and safe houses known as the Underground Railroad, according to the National Underground Railroad ...