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How Seattle's Tunnel Machine Is Steered Beneath City

from GeekWire

Spinning and pushing its way beneath Seattle, Bertha the SR 99 tunneling machine moved past the 5,280-foot mark recently, creeping ever closer to an end point it's expected to reach next spring. Like a "moving factory," Bertha continues to bore the tube and construct the rings that make up the outer wall of the nearly 2-mile tunnel. more

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