Rebuilding Russia's largest power plant, the 6,400-MW Sayano-Shushenskaya hydroelectric plant in southern Siberia, may take longer than expected as engineers deal with challenging logistics, a rare design, and uncertainty surrounding the accident that killed 75 people in August 2009.

"The vibration itself was a cry for help from the machine that something was going on. That machine, with that vibration level, should probably have been the last unit on and the first unit off. In the 12 to 14 hours preceding the failure, they ran that machine in zones that most places don't let their units even run." -- Donald Erpenbeck, vice president of MWH Americas Inc.,