1 / 3   Electricians carried out the final check on transmission towers over 380 meters above sea on Sunday before their trial run begins on January 7 on the Zhoushan Islands, east China’s Zhejiang Province. /VCG Photo

2 / 3   When working at height, electricians need to walk on transmissions lines with only 2.5 centimeters in diameter for hours amid strong wind, fog and low temperature. /VCG Photo

3 / 3   Serving the China (Zhejiang) Pilot Free Trade Zone (FTZ), the 500-kilovolt power transmission and transformation project has set 14 world records, including the world’s tallest power transmission tower and world’s first cross-linked polyethylene submarine cables. /VCG Photo