Bertha tunneling machine


bertha-resumes-digging-alaskan-way-viaduct
Bertha will soon begin digging below the viaduct its path will replace
Bertha back to drilling after suspension is "conditionally lifted"
Washington governor halts Bertha tunneling after sinkhole forms
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Bertha breaks through repair wall and begins tunneling soil once more (VIDEO)
VIDEO: Bertha, world's largest tunneler, resumes digging below Seattle after 2-year delay
Bertha is nearly ready to start tunneling again (VIDEO)
Big Bertha, world's largest tunnel-boring machine, arrives in Seattle