Bertha, the 57.5-ft diameter TBM building the S...
Bertha, the TBM mining the SR 99 tunnel in Seattle, was 219 ft from its end point as of March 27, according to the Washi...
Seattle Tunnel Partners has temporarily stopped mining to prepare Bertha, the SR 99 tunneling machine, for the final 1,0...
Crews building the SR 99 tunnel in Seattle reach another milestone on Dec. 13 as they installed the 1,000th ring. Tunnel...
The SR 99 TBM Bertha passed a significant milestone in its journey underneath Seattle. When the machine tunneled past Pi...
Seattle Tunnel Partners (STP) resumed mining following a temporary stop to change tools on the cutterhead of Bertha, th...
Bertha, the SR 99 tunneling machine, has traveled approximately 110 feet since Seattle Tunnel Partners resumed mining on...
Seattle Tunnel Partners has received conditional permission to resume tunneling operations on the SR 99 Tunnel Project. ...
Bertha, the SR 99 tunneling machine, is now tunneling in Seattle soil after breaking through the access pit wall late We...
According to the Washington State Department of Transportation (WSDOT) website, Seattle Tunnel Partners (STP), the contr...
