Bertha

Giant Drill Boring Seattle Tunnel Nears Finish Line
SEATTLE (AP) — Twenty-nine months late, the massive drill boring a new Highway 99 tunnel below Seattle is almost done with its work.
The Seattle Times reports that the drill, known as "Bertha," is expected to chew through a concrete retaining wall in the next few days and emer…
Seattle’s Tunneling Machine Bertha Veers Off Course
SEATTLE (AP) — Recent surveys have found that Seattle's new highway tunnel is a few inches off course and digging has stopped until next week while more measurements are made.
Seattle Tunnel Partners project manager Chris Dixon said Wednesday that surveys found the concrete tunnel rings being install…
Seattle Tunnel Delay Costs Now Expected to be $149 Million
OLYMPIA (AP) — Delays on the tunnel replacement for the Alaskan Way Viaduct through Seattle are now expected to cost the state about $149 million in overruns, a third less than feared in July.
Joe Hedges, program administrator for the Washington State Department of Transportation, said the main reaso…
Seattle Tunnel Machine Begins Work Again
SEATTLE (AP) — The machine digging a tunnel to replace Seattle's Alaskan Way Viaduct has resumed work.
State transportation officials said the boring machine, known as Bertha, resumed mining Tuesday after the state allowed the work to continue. Las...