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Straight circular subway tunnel with tubing and two different lights: white and yellow

Subway metro underground tunnel with blurry rail tracks in gallery

Washington, DC Metro

The construction of the subway tunnel

Tunnel worker examines pipeline in underground tunnel

Underground river flowing in round concrete sewer tunnel. Sewage collector

metro construction

Underground Tunnel in Blurred Motion, Brescia, Italy

Underground Tunnel

Subway, underground tunnel construction

Underground Tunnel

Colourful subway station in Munich Germany

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