Big bertha drill rig seattle

Seattle''s Big Bertha Tunneling Machine Back to

Seattle''s "Big Bertha" tunneling machine — or SR99 if you''re nasty — is finally drilling again three years after breaking down just 1,019 feet into

Bertha''s big breakthrough is here: Seattle tunnel

The disassembly pit where the SR 99 tunneling machine Bertha is set to emerge in Seattle on Tuesday. (GeekWire Photo / Kurt Schlosser) After

The Bertha Tunnel Boring Machine Completes Seattle''s Big Dig

The Bertha tunnel boring machine has finally completed its mission. We explore the much-anticipated construction journey through Seattle.

Engineering:Bertha (tunnel boring machine)

Bertha was a 57.5-foot-diameter (17.5 m) tunnel boring machine built specifically for the Washington State Department of Transportation''s (WSDOT) Alaskan Way Viaduct

Big Bertha: A 25,000 HP Mechanical Worm Designed

Big Bertha is a one-of-a-kind tunnel boring machine built specifically for the WSDOT project of replacing the Alaskan Way Viaduct in Seattle

Engineering:Bertha (tunnel boring machine)

Bertha was a 57.5-foot-diameter (17.5 m) tunnel boring machine built specifically for the Washington State Department of Transportation''s (WSDOT) Alaskan

Seattle''s Big Bertha Tunneling Machine Is Finally

We''ve covered the saga of the SR99 tunneling machine, better known as Bertha, since it broke down after only drilling though just 52 feet in

Bertha completes Seattle tunnel dig, next phase of

SEATTLE -- Bertha is done digging. After four years of moving -- and sitting broken for a while -- underneath downtown Seattle, the world''s

Hard grind: The epic journey of the world''s biggest tunnel boring

On April 4, the world''s largest tunnel boring machine broke through to the open air after almost four years underground. Called Bertha, the giant digger was tasked with the

How did we get here? A look back on Seattle''s tunnel

After launching in 2013, the world''s largest tunnel-boring machine has less than 220 feet to go before finishing its 1.7-mile trip. Here''s a look

Bertha – A Massive TBM''s 2 Mile Journey Underneath

View the complete article, including interview, here. Big construction requires big ideas, big money — and mammoth equipment. The

Seattle''s Big Bertha Tunneling Machine Is Finally

Five stories tall and the biggest drill of her kind, Bertha overheated in December 2013, only about a ninth of the way into the project to bore a

Seattle''s Big Bertha Tunneling Machine Back to Drilling After

Seattle''s "Big Bertha" tunneling machine — or SR99 if you''re nasty — is finally drilling again three years after breaking down just 1,019 feet into the project.

The ULTIMATE look at Bertha''s breakthrough

On April 4, 2017, one of the world''s largest tunneling machines chewed through more than 1,000 tons of concrete and fiberglass to end a 1.7 mile journey

Seattle''s big tunnel project reaches a milestone, but

That''s for two miles. Workers celebrate the breakthrough by a massive drilling machine, nicknamed Bertha, for an double-deck, underground

Huge tunnel borer Bertha stopped by simple steel

In this photo made with a fish-eye wide-angle lens, the massive boring machine known as Bertha that is drilling a two-mile tunnel to replace

Bertha, Seattle''s SR 99 Tunneling Machine, Is Finally

Bertha has broken through. After nearly four years underground, Seattle''s beleaguered boring behemoth clawed its way into daylight yesterday,

Big Bertha, world''s largest tunnel-boring machine, arrives in Seattle

The "Big" in Bertha''s name isn''t there for the catchiness. It''s there because it''s apt. With a 57-foot diameter and a length of a football field, Big Bertha is the world''s largest

Bertha Rescue Shaft

Malcolm''s Solution for Bertha''s Underground Rescue Malcolm Drilling was awarded the support of excavation contract to drill the rescue shaft for Bertha, the world''s largest Tunnel Boring