The Rotterdam subway was built by
A) Raising the tunnel on stilts to keep it above the local water table.
B) Building the tunnel in segments which were flooded, sunk into position, then joined and pumped dry.
C) Draining water from below the city to allow excavation of a dry tunnel.
D) Baking the ground to harden the clays, then blasting the tunnel through.
Correct Answer:
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