Seattle tunnel-boring machine stuckDecember 9, 2013 @ 9:56 pm
SEATTLE (AP) - The giant machine boring a highway tunnel under downtown Seattle is stopped in its tracks and officials are trying to figure out why.
Washington Transportation Department spokeswoman KaDeena Yerkan says the machine known as Bertha hit some kind of obstruction Friday night. Late Monday, managers were still trying to figure out what that might be.
Yerkan says they don't know whether the obstruction is man-made or natural.
The Seattle Times reports ( http://is.gd/9IxWqr) that Yerkan says other drill rigs might be used to dig vertical holes over or near the buried object.
Bertha is tunneling 60 feet below the surface, between South Jackson Street and South Main Street.
The department says the machine has traveled about 1,000 feet along its two-mile route since tunneling started last summer.
The 326-foot-long machine is creating a tunnel nearly 58 feet in diameter as part of the $3.1 billion project to replace the Alaskan Way Viaduct to carry Highway 99 traffic.
Information from The Seattle Times is included in this report.
Information from: The Seattle Times, http://www.seattletimes.com
(Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)
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