tunnel-boring machines


bertha-resumes-digging-alaskan-way-viaduct
Bertha is nearly ready to start tunneling again (VIDEO)
Bertha delayed again; won't restart drilling until late December
Crews prepare soil for Bertha to begin tunneling again
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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
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
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