More From tunnels

Big Bertha is set to start drilling again in November after extensive repairs, testing

Big Bertha is set to start drilling again in November...

Posted by Bobby Atkinson on Jul 21, 2015

The world's largest tunnel-boring machine is now scheduled to get back to work on November 23, nearly two years after it overheated ...

FHWA creates new National Tunnel Inspection program

FHWA creates new National Tunnel Inspection program

Posted by Bobby Atkinson on Jul 21, 2015

The U.S. Department of Transportation's Federal Highway Administration has created a new tunnel inspection program modeled after the decades old ...

Crews begin installation of Big Bertha’s new seal system

Crews begin installation of Big Bertha’s new seal...

Posted by Wayne Grayson on Jun 16, 2015

While the rest of her massive frame waits below ground, Big Bertha has undergone the most pivotal portion of her ...

Board rules WSDOT should have given contractor more warning about pipe struck by Big Bertha before stall

Board rules WSDOT should have given contractor more...

Posted by Wayne Grayson on May 12, 2015

In regard to the drilling of the new State Route 99 tunnel below Seattle, the Washington State Department of Transportation ...

Water main damaged by Big Bertha repair excavation could cost WSDOT $4 million

Water main damaged by Big Bertha repair excavation...

Posted by Wayne Grayson on Apr 14, 2015

Four months after crews temporarily stopped excavation on a repair pit for the world's largest tunnel-boring machine due to ground sinkage, ...

Sixth element, reaching 90 feet deep, placed for Midtown Tunnel in Virginia

Sixth element, reaching 90 feet deep, placed for...

Posted by Chris Hill on Mar 13, 2015

The sixth of 11 elements being used to create a new two-lane Midtown Tunnel connecting Portsmouth and Norfolk, Virginia, was ...

Lady Bird is installed below Washington D.C. before getting to work last year.

Lady Bird is the 1,300-ton tunnel-boring machine...

Posted by Wayne Grayson on Mar 19, 2014

Each year in Washington, D.C., about 2 billion gallons of raw sewage is dumped into the Potomac River, the Anacostia River ...

Big Bertha, world’s largest tunnel-boring machine, lowered into starting position in Seattle

Big Bertha, world’s largest tunnel-boring...

Posted by Wayne Grayson on Jun 05, 2013

With the digging of the Washington State Route 99 tunnel in Seattle scheduled to start in July, the Washington State Department of ...

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

Big Bertha, world’s largest tunnel-boring...

Posted by Wayne Grayson on Apr 04, 2013

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 ...

NYC tunnel expansion the largest transportation project in U.S.

NYC tunnel expansion the largest transportation project...

Posted by Wayne Grayson on Feb 28, 2013

New York City is undergoing the biggest addition to its transportation system since Penn Station opened in 1910, Time reported. ...

Japanese tunnel collapses, kills 9

Japanese tunnel collapses, kills 9

Posted by Amanda Bayhi on Dec 04, 2012

Aging bolts are a possible culprit behind the collapse of concrete ceiling slabs that fell from the roof of a ...

The city under your feet

Posted by John Latta on Aug 06, 2012

Under many of our big cities is another city. A place of tunnels and sewers and open spaces. Steve Duncan studies and ...

advertisement
advertisement
advertisement
advertisement