The 57-foot-wide Highway 99 tunnel drill has passed below the Battery Street Tunnel, heading toward a spring finish near Seattle Center.
Read more about the technical challenges and rising costs of the Highway 99 tunnel project, and the successes and travails of Bertha, the biggest-ever boring machine.
The Highway 99 tunnel drill started digging again under Belltown on Monday night, after 300 cutting teeth were replaced in a maintenance stop.
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.
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