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The high-tech, low-cost world of tunnel building

from MarketWatch

New technology has dramatically reduced the cost — and disruption — of building tunnels under busy cities for rail, road and utility projects. Massive robotic worms have been burrowing rail, road and utility tunnels under New York, Singapore and London, little noticed by residents. Washington, D.C., and Indianapolis are boring vast underground cisterns to store rainwater. And Cleveland is punching narrow sewer-pipe ducts through dirt and rock without ripping open streets or lawns. more

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