Seattle


Repairs to Big Bertha will include 86 tons of steel reinforcement to tunnel-boring machine's bearing, cutter drive
Repairs to Big Bertha will require a 12-story pit and removing the tunnel-boring machine's cutterhead
Construction worker uncovers mammoth tusk from Ice Age (VIDEO, PHOTOS)
Tunnel-boring machine Big Bertha shut down for "months" due to complexity of needed repairs
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VIDEO: Baby Bertha? Bechtel builds mini tunnel-boring machine using 50,000 Legos
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Tunnel-boring machine Big Bertha moves forward 2 feet in test run to see if blockage is fully removed
A steel pipe is what brought Big Bertha, the world's largest tunnel-boring machine, to a halt
Unstoppable Force, Immovable Object: Seattle's Big Bertha halted by mystery object
Is green building movement enough to revive use of heavy timber for framing in construction?
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Subway expansion in Delhi to set record with simultaneous use of 34 tunnel-boring machines