tunnels


VIDEO: Drone flythrough of twin tunnel construction at East End Crossing in Kentucky
Stronger Big Bertha cutter head lowered back into its pit for tunneling
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Big Bertha is set to start drilling again in November after extensive repairs, testing
FHWA creates new National Tunnel Inspection program
Crews begin installation of Big Bertha's new seal system
Board rules WSDOT should have given contractor more warning about pipe struck by Big Bertha before stall
Water main damaged by Big Bertha repair excavation could cost WSDOT $4 million
Sixth element, reaching 90 feet deep, placed for Midtown Tunnel in Virginia
Big Bertha, world's largest tunnel-boring machine, lowered into starting position in Seattle
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