Big Bertha

Bertha pushes past halfway point of tunneling for Washington’s SR 99
VIDEO: A drone's-eye view of Bertha's work inside Washington's SR 99 tunnel
Bertha will soon begin digging below the viaduct its path will replace
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Bertha back to drilling after suspension is "conditionally lifted"
Washington governor halts Bertha tunneling after sinkhole forms
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)
Bertha delayed again; won't restart drilling until late December
Crews prepare soil for Bertha to begin tunneling again