Drilling crews started on Friday and plan to continue around the clock for a month, injecting a cement-water mix into the ground where a shaft will be dug to expose the front of the stalled tunnel machine.
Construction is now the fastest-growing industry in Washington state. Construction cranes fill the skyline. Public works projects like light rail lines and the tunnel project snarl our streets. But despite appearances, construction has not yet fully recovered from the 2008 recession.
The world’s largest tunneling machine started grinding into the soil beneath downtown Seattle Tuesday afternoon. The machine known as Bertha is digging a 58-foot-wide tunnel to replace the Alaskan Way Viaduct.