Video: Seattle Holds Send-Off for Big Berth TBM

Washington’s Governor, Jay Inslee and WSDOT had a celebration over the weekend to allow the public the chance to see the world’s largest tunnel boring machine, Big Bertha, before she begins her drive for the creating the Highway 99 tunnel underneath downtown Seattle. This is the tunnel that will replace the aging Alaskan Way Viaduct. Check out the great video below from Seattle’s King 5.