The Washington State Department of Transportation has released a new 360-degree video, taking viewers inside the tunnel that's expected to open to traffic in 2019.
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.
After launching in 2013, the world's largest tunnel-boring machine has less than 220 feet to go before finishing its 1.7-mile trip. Here's a look back...
Tunnel machine Bertha is back on a slightly shifted course this week, after measurements confirmed it was 6 inches east of the correct position. It...
Tunnel machine Bertha has stopped for measurements and maintenance until early next week, when operators might need to correct the path
The 57-foot-wide Highway 99 tunnel drill has passed below the Battery Street Tunnel, heading toward a spring finish near Seattle Center.
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.
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