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The construction of the Dartford Tunnel. A view of the cementation around the tunnel shield. 1938
The construction of the Dartford Tunnel. Workers building the main tunneling shield by the entrance to the pilot tunnel. 1938
Work on the Dartford Tunnel. The process of cementation in which holes are bored in the chalk, and at a pressure of 100lb. per square inch liquid cement is pumped in and fills up the fissures
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