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Bangkok, Thailand – January 29, 2016: View of construction site in Bangkok. People work inside the construction site.

Dark dirty abandoned subway tunnel with rusty railway.

A highway under construction, including a false tunnel, as seen from above

A hydro electric water pipeline passes beneath a dirt road overpass.

Industrial concrete tunnel perspective, part of abandoned underground submarine base from USSR period. Balaklava, Crimea

Pouring concrete cement on the foundation of residential building under construction using a concrete pump truck machine.

Hong Kong, Сhina - November 10, 2014: Industry workers and heavy plant on a large construction site, Hong Kong.

Black and white photograph of the inside of a tunnel traveling eastbound in Colorado Rocky Mountains.

New concrete drainage rainwater collector, in a concrete pipe, inside view.

Railway tunnel under construction. Black and white

A highway under construction, including an artificial tunnel, as seen from above

$Gunma, Japan -August 11, 2024: This is the Usui Pass Tunnel. It is a railway tunnel that passes through Usui Pass (between Yokokawa and Karuizawa) that opened in 1893.The line is now abandoned, and you can walk through it.There are currently 10 tunnels on the old line that you can pass through.\nIt has been designated as an Important Cultural Property of Japan, along with Usui Third Bridge (Megane Bridge), the largest 4-arch bridge in Japan.$

Longsheng, China - September 13, 2008: Two female farm workers in Longsheng County, Guangxi Province in the southern part of China are preparing soil for planting rice terraces (Longji or Dragon's Backbone).

Johannesburg, South Africa – April 02, 2024: Worker using dump truck as mine shaft in industrial setting

Underground vaulted urban sewer tunnel with dirty sewage.

Gravel is pulled straight with a machine to lay paving stones

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

A large sluice gate in the water delivery tunnel was installed with scaffolding equipment for maintenance work.

Brunssum, the Netherlands, - June 12, 2018. New prefab tunnel under the highway in construction.

Sewage drainage pipe, sewage flows from the collector. Environmental pollution.

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

Installation of a sewer cover during road reconstruction. Cover is going to be surrounded with newly laid asphalt in Ljubljana, Slovenia, Europe.

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