Introduction of Bertha Digs Seattle
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Underneath Seattle: Steering Bertha
Bertha- Raising tunnel boring machine Bertha from below
This machine is digging a big hole through Seattle!
Bertha: a timeline of the tunnel boring machine's progress
Seattle's tunnel boring machine finishes digging a hole under the city
Underneath Seattle: Meet one of Bertha’s ring-builders
Underneath Seattle: Working Under Pressure to Keep Bertha Moving
Bertha's cutterhead spins in Seattle
Digging down to repair the SR 99 tunneling machine
Seattle's Big Bertha tunnel drill blocked by mystery object
Bye-Bye to Bertha, the world’s largest tunneling machine
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Last Updated: August 11, 2026
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