The 21-foot diameter cutting head of Sound Transit's tunnel boring maching (dubbed the Emerald Mole) broke through the east side of Beacon Hill into Georgetown on May 8 at approximately 8:15 a.m. A video of the machine's final push can be viewed at www.soundtransit.org/x5788.xml. The "hole-through" completes the machine's first 4,300 foot trip. Since Obayashi Corporation launched the tunnel boring machine in January 2006. In June the machine will be transported back to the west side of Beacon Hill to begin drilling the second tunnel. The first tunnel is for southbound trains, the other northbound.[[In-content Ad]]
