SEATTLE (AP) — The world’s largest tunneling machine is sinking its teeth into the soil under downtown Seattle.

The state Transportation Department says the boring machine it calls Bertha is starting work Tuesday.

It will take more than a year to dig a two-mile tunnel that will carry Highway 99 traffic under the city. That will allow the Alaskan Way Viaduct to be torn down.

Copyright 2013 The Associated Press.

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