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tunnel boring machine
As Bertha visits the dentist, a look at how this machine digs and builds the SR99 tunnel at the same time (VIDEO)
Bertha, the world's largest and perhaps most beleaguered tunnel boring machine, has been halted deep below the streets of Seattle once ...
Bertha will soon begin digging below the viaduct its path will replace
The world's largest tunneling machine will soon begin its dig beneath the Alaskan Way Viaduct in Seattle, its first activity ...
Bertha is nearly ready to start tunneling again (VIDEO)
The massive tunnel-boring machine that's been sidelined in Seattle for two years could be back to boring by New Year's. The ...
Bertha delayed again; won’t restart drilling until late December
The Seattle Tunnel Partners have once again delayed the restart of drilling for the State Route 99 tunnel, with Bertha not expected ...
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Big Bertha wakes from one-year nap, begins to chew her way into repair pit
For the first time in more than a year, Big Bertha actually bored. According to a report from the Seattle Times, the world's largest ...
Repairs to Big Bertha will require a 12-story pit and removing the tunnel-boring machine’s cutterhead
Officials from the Washington State Department of Transportation have announced that in order to repair the world's largest tunnel-boring machine, ...
Tunnel-boring machine Big Bertha shut down for “months” due to complexity of needed repairs
Washington State Department of Transportation officials say Big Bertha, the world's largest tunnel-boring machine, is likely out of commission for ...
VIDEO: Baby Bertha? Bechtel builds mini tunnel-boring machine using 50,000 Legos
The Lego Movie, which hit theaters this past weekend, is fantastic. But we wish the folks who made it had ...
Another mystery overheats, halts tunnel-boring machine Big Bertha once more
The Washington State Department of Transportation officials in charge of the world's largest tunnel-boring machine have another mystery on their ...
A steel pipe is what brought Big Bertha, the world’s largest tunnel-boring machine, to a halt
The mystery is solved—in part at least. After Big Bertha, the world's largest tunnel-boring machine, was brought to an abrupt halt ...
Unstoppable Force, Immovable Object: Seattle’s Big Bertha halted by mystery object
Has Big Bertha met her match? She has, at least for the time being. The world's largest tunnel-boring machine was recently ...
Subway expansion in Delhi to set record with simultaneous use of 34 tunnel-boring machines
Seattle might have the world's largest tunnel-boring machine, but Delhi, India will soon have a record-setting host of the machines ...
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U.S. highways are shifting to alternative interchange designs
VIDEO: Crews demo century-old Virginia St. Bridge, construct and move new one into place (Time-lapse)
Unsafe surroundings: Unrecognized hazards could cause trouble for you – or for someone else
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