High and Deep Andean Tunnel Tests a Contractor's Mettle
By C.J. Schexnayder

Brazilian construction giant Construtora Norberto Odebrecht S.A. has taken on a difficult construction challenge - drilling an 11.2-kilometer tunnel through a mountain more than 2,400 meters high in Central Ecuador. A pair roof collapses late last year trapped an $11.2-million tunnel boring machine requiring several months to rescue and get the project back on track.
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The TBM was put in operation in March 2005 and the headrace tunnel was scheduled to be completed by last April. Difficulties with faults along the tunnel route have slowed progress but Odebrecht officials say they will complete the project by the December deadline. (Photo courtesy of Odebrecht)
 
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