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Bertha, the Boring Machine, Digs Out of Launch Pit

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WSDOT
Crew members adjust the SR 99 tunneling machine’s segment feeder, which moves into place the curved concrete segments that form the tunnel walls.";

The machine boring a new Highway 99 tunnel under downtown Seattle has finally dug itself out of its own launch pit.

The Transportation Department said Wednesday the 326-foot long machine it calls Bertha has drilled 359 feet.

Spokeswoman KaDeena Yerkan says the trailing gear has disappeared into the tunnel.

Yerkan says Bertha is operating well but is still in the initial phase with about 9,000 feet to go.

The world's largest tunnel boring machine is creating a tunnel nearly 58 feet in diameter as part of the $3.1 billion project to replace the Alaskan Way Viaduct, the double deck highway along the downtown Seattle waterfront.

Digging began July 30 but soon shut down for about a month in a labor dispute before it resumed on Sept. 23.

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