BusinessLondon's Massive Subway Tunneling Machines Build as They DestroyThe eight sensor-loaded machines boring tunnels under London are accurate to within a few millimetersFacebookXLinkedInEmailLinkGiftFacebookXLinkedInEmailLinkGiftGift this articleContact us:Provide news feedback or report an errorConfidential tip?Send a tip to our reportersSite feedback:Take our SurveyNew WindowFacebookXLinkedInEmailLinkGiftBy Barrett W. SheridanJune 6, 2014 at 12:40 AM UTCBookmarkSaveLock This article is for subscribers only.This article is part of the June 9, 2014 issue of businessweek.Chevron RightExpand ExpandBreaking through into a station at London’s Canary Wharf in June 2013Photograph by Andrew Winning/Reuters
