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Back two construction engineers discussing help create a plan with a blueprint home building at the construction site, Rectangular concrete infrastructure of drain system.

Safety barrier around an open manhole in the street

Metal sewer pipes for laying external sewage system at construction site in clay trench. Industrial concept.

$[url=http://www.istockphoto.com/search/lightbox/11116736#18bbc827/]\n[IMG]http://i1297.photobucket.com/albums/ag30/001abacus/tunnel.jpg[/IMG]\n[/url]$

Riga, Latvia - June 27, 2019: Heat pipe replacement works on Dzelzavas Street.

Flooded vaulted sewer tunnel with water reflection.

texture of natural, raw salt in an underground salt mine, Turda salt mine, Romania

salvador, bahia, brazil - july 29, 2022: construction of sewage pipeline exclusive way for BRT transport system in the Lucaia canal region in the city of Salvador.

road tunnel construction on a highway, bypassing mountains and connection roads

speeding through the tunnel with pocket watch

Dark dirty abandoned subway tunnel with rusty railway.

Preparing to lift out a buried propane tank with the bucket on an excavator

Construction site crew with equipment lay a concrete pipe line under the ground.

An underground tunnel, rails and wagons for the city's wastewater

Old oil pump oil field in the outskirts of Manama city Bahrain

Insulated pipes in the trench. Reconstruction and replacement of the water pipe

Underground tunnel and subway rails. Transport pipeline by Tunnel Boring Machine for electric train subway.

$Image show dame to property, cars and freeways as the earthquake destroyed Northridge\n\nAt 4:30 am, on January 17, 1994, residents of the greater Los Angeles area were rudely awakened by the strong shaking of the Northridge earthquake. This was the first earthquake to strike directly under an urban area of the United States since the 1933 Long Beach earthquake.$

Round tiled tunnel in abandoned underground nuclear physics laboratory, Sukhum, Abkhazia

Inside the pipes of a chemical plant under construction

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