The Rig 421 or plan C drill, left, stands next to the T-130 or Plan B drill, two out of three drills working on the rescue operation of 33 miners who remain trapped at the San Jose mine near Copiapo, Chile, Thursday, Oct. 7, 2010. The miners have been trapped deep underground in the copper and gold mine since it collapsed on Aug. 5. (AP Photo/Roberto Candia, POOL)
Read the article: U.S. expert: Chile "good and lucky" but risks remain
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