TBM


Water main damaged by Big Bertha repair excavation could cost WSDOT $4 million
Excavation stopped on Big Bertha repair pit due to major ground sinkage in area
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Drilling delays a problem for tunnel-boring machine Big Bertha even as she slumbers below ground
Camera gives a live view of construction on Big Bertha's 12-story repair access pit
Repairs to Big Bertha will require a 12-story pit and removing the tunnel-boring machine's cutterhead
VIDEO: Baby Bertha? Bechtel builds mini tunnel-boring machine using 50,000 Legos
Another mystery overheats, halts tunnel-boring machine Big Bertha once more
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
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