Bertha, the SR 99 tunneling machine, is now tunneling in Seattle soil after breaking through the access pit wall late Jan. 6. Seattle Tunnel Partners (STP), the lead contractor, has mined 73 feet and installed 12 concrete tunnel rings since Bertha first moved forward in the pit...
News Briefs: Bertha Tunneling Again in Seattle
In this week's news, Bertha is back to tunneling again under Seattle, and Aegion has announced that it will purchase Underground Solutions
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