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Underground construction workers often work under reduced light condition, in dangerous spaces, and are at a high risk of exposure to contaminants, fire, and explosions. In the United States the Occupational Safety and Health Administration (OSHA) first adopted unique regulations for underground construction in 1971.
Zakim Bunker Hill Bridge over the Charles River under construction, looking north. The old elevated Central Artery crossing is to the right. Another important motivation for the final form of the Big Dig was the abandonment of the Massachusetts Department of Public Works' intended expressway system through and around Boston.
Tunnel Construction. Tunnels are dug in types of materials varying from soft clay to hard rock. The method of tunnel construction depends on such factors as the ground conditions, the ground water conditions, the length and diameter of the tunnel drive, the depth of the tunnel, the logistics of supporting the tunnel excavation, the final use and shape of the tunnel and appropriate risk management.
Downtown Port Angeles had a problem with constant flooding and high tides in the early 1900s. The streets were raised in 1914, leaving a network of underground tunnels that visitors can explore ...
Secret escape tunnels used by the Assad family have been discovered after their tyrannical regime was overthrown by Syrian rebel forces over the weekend.. A video allegedly shows an underground ...
A woman on TikTok has gained notoriety for an unusual home improvement project: digging a tunnel that is 30 feet long and 20 feet deep under her suburban home.
Airport Tunnel (Las Vegas), tri tunnels (two road tunnels and one future transit tunnel), under runways 7L/25R and 7R/25L and several taxiways at Las Vegas McCarran International Airport, connecting the Airport Spur Connector (unsigned SR 171) to Paradise Road in Paradise
Cave dweller, Underground living; Cave temple; Cellar; Dungeon; Dugout (shelter) Fogou; Hypogeum; Mine; Rock cut architecture, rock-cut tomb; Smuggling tunnel; Tunnels (street tunnel, train tunnels) Underground city, umbrella article for underground dwellings and facilities; Underground rapid transit system; Wine cave