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#99closure feature: Drone footage inside the SR 99 tunnel

Just a few days before the SR 99 tunneling machine started tunneling under the Alaskan Way Viaduct, the Washington State Department of Transportation flew a video-equipped drone through the SR 99 tunnel to show Seattle Tunnel Partners’ construction progress. There has been continued interest in seeing what has been built below ground and this video gives a glimpse of the tunnel as well as the nooks and crannies of the complex tunneling machine.

On an average day, the tunnel is bustling with construction. To avoid disrupting crews, this video was recorded in between regular work shifts.

At the time this was recorded, Bertha had traveled a total of 1,560 feet. As of 11 a.m. on May 3, Bertha  has traveled a total of 1,677.