The Highway 99 tunnel drill started digging again under Belltown on Monday night, after 300 cutting teeth were replaced in a maintenance stop.
Read more about the technical challenges and rising costs of the Highway 99 tunnel project, and the travails of Bertha, the biggest-ever boring machine.
Steady digging by Bertha has helped the state reduce its worst-case estimate of cost overruns by nearly $80 million, though big risks remain.
Highway 99 tunnel machine Bertha has completed most of the dig to South Lake Union, making room to assemble the double-decker road behind the drill.
Noise, vibrations, blight: A Pioneer Square building owner says the state owes him almost $400,000 for damage and lost income suffered during years of Highway...
Claims by Highway 99 tunnel contractors have risen to $480 million, though the state won an early round in court this past week.
Transportation reporter Mike Lindblom breaks down Bertha: Will she finish? And who will pay for overruns? And we host a debate over an initiative to...
Bertha restarted Tuesday after just a six-day shutdown, as inspectors found little or no erosion in the cutting bits.
Highway 99 tunnel-boring machine Bertha will stop Wednesday for replacement of eroding cutter bits, just beyond the midpoint of its 1.7-mile route. And FYI, drivers,...
With Bertha midway between Sodo and South Lake Union, new drone footage shows where the boring machine will break through near Mercer Street.
Tunnel machine Bertha is churning ahead, now passing the halfway point of its 1.7-mile dig.
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