Bertha takes first bite of new Seattle tunnel

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Boring Seattle Tunnel
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Boring Seattle Tunnel
Several sections of "Bertha," the massive tunnel boring machine that is expected to spend the next 14 months drilling a two-mile tunnel to replace the 60-year-old Alaskan Way Viaduct, are shown Saturday, July 20, 2013 in Seattle. The tunnel will replace the viaduct, a double deck highway along the downtown Seattle waterfront. (AP Photo/Ted S. Warren)