Tag: tunnel-boring machine Big Bertha

Construction Equipment

Before Bertha repairs begin, archaeologists will test soil for artifacts

Before workers in Seattle begin to dig a 12-story pit to make the necessary repairs to get the world’s largest tunnel boring machine running once again, they must step aside to allow archaeologists to search the soil for artifacts. Sixty vertical holes were drilled into the soil 48 feet above dormant Big Bertha, the tunnel-boring […]

March 25, 2014

Construction Equipment

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 hands deep below Seattle. After finally getting moving again last week following a two-month period of downtime, Big Bertha has been halted once again. This time, for a different, and unknown, reason. Workers put Bertha […]

February 4, 2014