Giant 'Bertha' Stuck Under Seattle With Broken Seals

Newcomb, Tim
February 2014
ENR: Engineering News-Record;2/24/2014, Vol. 273 Issue 8, p21
Trade Publication
The article reports on the Alaskan Way Viaduct project as Seattle Tunnel Partners (STP) await repairs to Bertha, the 7,000 ton, 300-foot long tunnel-boring machine that is attempting to dig a state Route 99 tunnel underneath Seattle, Washington as of February 2014. It notes strategies by STP, a joint venture of Dragados USA and Tutor Perini Corp., to reach Bertha 50 feet below the ground after discovering the broken bearing seals.


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