Tunneling a link: Paper streamers are launched overhead as workers and officials lean over to watch a ceremonial bottle of “champagne” from a zip line smash against a tunnel boring machine several stories below at the University of Washington in Seattle on Monday. The event celebrated the launch of the first deep-tunnel boring machine for the University Link light-rail link, part of a three-mile tunnel that will connect the school with the Capitol Hill neighborhood and the downtown Westlake Center. (Associated Press)
