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The Scientific experiment call Biosphere 2 in Tucson Arizona in the USA
Tunnel in the dark. Pedestrian crossing through a tunnel above the road. Long corridor. Transport infrastructure.
Mining works
WWII Oil Storage Tunnel in Darwin, Australia.
Photo of an empty underground cement entrance to a nuclear blast shelter.
Coal mine underground corridor with support system and  railroad tracks, Makoszowy coal mine in Zabrze, Poland
Futuristic pedestrian tunnel
Vaulted concrete underground tunnel of sewer, heating duct or water supply system.
Futuristische Architektur einer U Bah Station In Köln
Long steps towards mine tunnel
Close-up of large and long round concrete pipes, which light up through the early morning.
Light at the end of the tunnel or  the way to look forward to achieve the goal in your life
Horizontal water pipe or pipeline in a mountain tunnel. Irrigation system, agriculture, transportation concepts. Selective focus.
Pedestrian underpass in city, background with copy space, Sydney CBD, full frame horizontal composition
Staring down an old tunnel with a light at the end of the tunnel.  This is a ventilation tunnel inside the Hoover Dam.
Close-up of metal pipelines in industrial plants
Underground Mining Tunnel with Support Mesh
Inside the pipes of a chemical plant under construction
exploitation hollow with the modern mesh on the ceiling in copper mine.
Man Placing a Mouse Trap at the Mouse Hole Entrance
Mine Shaft entrance. Gold mine interior. Dark cave
Coal mine underground corridor with steel support system and industrial equipments, Bochum, Germany
Black and white photograph of the inside of a tunnel traveling eastbound in Colorado Rocky Mountains.
Female engineer at work, at the electricity power plant construction site.
Сonstruction of iron pipe on the river bottom
The newly renovated Tyne Cyclist and Pedestrian Tunnel. It runs under the River Tyne between Jarrow and Howdon in Tyne & Wear, England.
Horizontal perspective of water pipe in a mountain tunnel, irrigation system. Agriculture concepts.
Old, broken, and empty industrial space with high ceilings, exposed beams, and scattered debris.
A twenty-foot diameter ball mill rotates at a copper mine's underground processing facility in Chile.  This process breaks copper-bearing ore from golf-ball sized pieces into dust. Dozens of other pumps, motors, ladders, cranes, lights, and scaffolding is visible surrounding this equipment.
A unique underground tunnel with curved walls and an abstract architectural design.
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