20th century workers in cylindrical tunnelling shield, protective structure used during the excavation of large, man-made tunnels

- Image ID: 2ARCJKD
20th century workers in cylindrical tunnelling shield, protective structure used during the excavation of large, man-made tunnels Stock Photo
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20th century workers in cylindrical tunnelling shield, protective structure used during the excavation of large, man-made tunnels
Arterra Picture Library / Alamy Stock Photo
Image ID: 2ARCJKD