Nearly two years after officially going into operation in November 2014, the Sichuan-Tibet Grid Interconnection Project has started to receive its first overhaul. Most construction sites for the project are in high mountain areas with an average attitude of 3,850 meters. On Tuesday, the workers changed an insulator that was broken by stormy weather, and walked on wires 1,013 meters long for security checks. Watch the video to take a look at these breathtaking moments!
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