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Seattle Tunnel Partner workers roosting in the spokes of the Bertha TBM after the breakthrough
Project Related

Breakthrough! Bertha TBM Completes Alaskan Way Viaduct Tunnel in Seattle

April 5, 2017 rockman Comments Off on Breakthrough! Bertha TBM Completes Alaskan Way Viaduct Tunnel in Seattle

After tunneling 9,270 feet under downtown Seattle, the Bertha tunnel boring machine finally broke through at the north portal yesterday. The breakthrough marks a major milestone in the project to replace the seismically deficient SR-99 […]

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