USA: Bottom of Launch Pit, SR 99 Tunnel Project, Seattle, WA

360° panorama by Bill Edwards.
Click the image to open the interactive version.

Welcome to the floor of the SR 99 tunnel launch pit. This photo gives you a sense of just how big this tunnel project is. Those concrete walls on either side of the tunnel launch pit are made up of interlocking concrete piles, 80 feet tall, that hold back the ground and water. See the worker looking up? Scroll toward the sky to see construction material being lowered into the pit. From this location, you can also see the walls of what will become one of the two tunnel operations buildings that will monitor everything from traffic to air quality inside the new tunnel.This 360-degree photo is part of a virtual tour of the SR 99 Tunnel Project in Seattle. Learn more about the Alaskan Way Viaduct Replacement Program at or follow Bertha, the SR 99 tunneling machine, on Twitter @BerthaDigsSR99.

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