Background on Worlds Largest Tunnel Boring Machine Ever Built Inside Big Berthas
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The ULTIMATE look at Bertha’s breakthrough
Seattle's Big Bertha tunnel drill blocked by mystery object
Digging Deep: Inside The World's Biggest Tunnel Megaprojects
Mystery object blocks world's largest tunnel boring machine in Seattle
Tour of the world's largest TBM
Bye-Bye to Bertha, the world’s largest tunneling machine
Bertha - the world’s largest tunnel boring machine
Bertha's cutterhead spins in Seattle
Bertha Digs Seattle
Seattle SR 99 Bertha 10-month time-lapse - every frame - tunneling machine disassembly area
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Last Updated: August 11, 2026
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