May 31 project update: Tunnel boring 25 percent complete

Posted on May 31 2016 5:12 PM
As of May 31, Seattle Tunnel Partners crews have tunneled a total of 2,314 feet. Tunnel boring is now 25 percent complete. 
 
Bertha is located in zone 3 of the tunnel drive. The top of the machine is approximately 105 feet below the surface, approaching Marion Street.
 
Look for another progress update on Thursday. 
 

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