tunnel building

VIDEO: The Zipper truck builds tunnels in no time without any adhesive
Stronger Big Bertha cutter head lowered back into its pit for tunneling
Big Bertha is set to start drilling again in November after extensive repairs, testing
Crews begin installation of Big Bertha's new seal system
construction boom cities of 2017 From our partners
Board rules WSDOT should have given contractor more warning about pipe struck by Big Bertha before stall
Did Seattle’s SR 99 tunnel really require Big Bertha? Indeco argues breakers are the answer
Unstoppable Force, Immovable Object: Seattle's Big Bertha halted by mystery object
NYC tunnel expansion the largest transportation project in U.S.