Drilling Latin America’s largest sewer

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In this Aug. 19, 2014 photo, workers shovel ground rock, left by the giant boring machine, to a conveyer belt inside the Tunel Emisor Oriente in Zumpango, Mexico. Scheduled to be completed by 2018, a decade after it was begun, the 62 kilometer (38 mile) tunnel will be the largest sewer in Latin America. (AP Photo/Sean Havey)ZUMPANGO, Mexico (AP) — Some 110 meters (120yards) beneath a Mexico City suburb, a boxcar-size machine digs Latin America’s largest sewer.