Bertha is stuck still

The continent’s largest tunnel-boring machine is underground in Seattle. And it isn’t going anywhere right now. I explain how Bertha originally got stuck trying to dig a new State Route 99 tunnel, why she remains stuck and what officials hope to do to get her going again in my Popular Mechanics article. Check it out here.

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How They Plan to Get Bertha Moving Again (This is About a Tunnel-Boring Machine)

North America’s largest tunnel-boring machine sits waiting under Seattle as crews try and figure out exactly what stands obstructing her path. It is a complicated process to not only devise a plan to investigate the issue, but also stand ready to fix it once it is found. Read more at my Engineering News-Record article on the situation.

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Most Recent ENR Blogs

My four most recent Engineering News-Record blog posts include looks at a brand-new bridge deck coming apart in Portland, WSDOT adding a new wrinkle to overseeing its mega-projects, Vancouver’s VanDusen Garden still pulling in awards for its architectural and engineering design and big tunnel-boring machine Bertha getting new teeth.

Mega Lift Required Precision for Bertha TBM

Just getting Bertha, the continent’s largest-ever tunnel-boring machine, into place to dig the new State Route 99 tunnel underneath downtown Seattle proved quite the task. Take a look at my Engineering News-Record story about Barnhart moving Bertha into place here.

Meet Bertha: The World’s Largest-Diamter Tunneling Machine

She may be in 41 pieces, loaded on a boat and headed to Seattle, but when crews put Bertha back together a few hundred yards from Elliott Bay, they will have the world’s largest-diameter tunneling machine. Check out a bit of the information about Bertha’s move and next steps via my Engineering News-Record blog here.

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