The pit will be 120 feet deep and about 80 feet in diameter. After it’s completed in September, workers plan to lift out the head of the machine to repair seals and bearings.
The machine dubbed Bertha ground to a halt in early December about 1,000 feet into the 1.7-mile Highway 99 tunnel that will replace the Alaskan Way Viaduct.
Bertha is expected to resume boring again in March 2015, and the contractor, Seattle Tunnel Partners, hopes to have the tunnel open in November 2016.
More Northwest Headlines
2 Yakima County men sentenced for killing eagles USGS awards $4M in Northwest, California for earthquake early warning systems Commuter train hits vehicle in Puyallup, kills 1 woman Ex-tribal police chief pleads guilty to stealing from Swinomish Tribe Hearing Friday on suit over Kurt Cobain death-scene photos Guilty plea in crash through Sammamish home that killed 2 Suit seeks to block anti-tax measure from Washington ballot Shell icebreaker retreats after showdown with protesters
Our new comment system is not supported in IE 7. Please upgrade your browser here.