tunnel drilling

file photo of a tunnel boring machine (photo credit: GIUSEPPE CACACE/AFP/Getty Images)

Seattle Viaduct Sinks Half-Inch Near New Tunnel

The Alaskan Way Viaduct has sunk nearly half-an-inch at one location where a machine has been boring a highway tunnel under downtown Seattle.

CBS Seattle–02/25/2014

(Photo credit MANAN VATSYAYANA/AFP/Getty Images)

‘Big Bertha’ Drilling Machine Is Stuck

Seattle’s tunnel-boring machine, known as ‘Big Bertha,’ hit an obstruction and is stuck

CBS Seattle–12/09/2013