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The Mystery Buried Beneath Seattle- What Is It
The ULTIMATE look at Bertha’s breakthrough
Video of Seattle Tunnel Partners rotating Bertha's cutterhead
Building a new State Route 99 through Seattle
Beneath the Streets: Seattle Underground Tour
Seattle's tunnel boring machine finishes digging a hole under the city
Inside the SR99 tunnel
Bertha's cutterhead spins in Seattle
Disassembling Bertha – the first cutterhead lift
Seattle Tunnel Partners' work plan for repairing Bertha with narration
Bertha
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Last Updated: August 11, 2026
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