Highest power station under construction in China
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China is constructing the world's highest power transmission station. 
The Markam power substation on La Wu Mountain in southwest China's Tibet Autonomous Region has an average altitude of 4,300 meters.
Zhang Qifa, a manager, is among the 50,000 workers assigned to do the job at a high altitude.
He said the project “is the highest, toughest, and most complicated in the world.” 
Despite the high altitudes, variable weather conditions, oxygen deficits, and many other challenges, Zhang considers it as a great honor to be part of the project. 
One-third of the substation's construction has been completed, and the project will be finished in August 2018, CGTN’s Rory Coen reports.
One of Zhang's colleagues will get married soon, but due to his busy schedule, his fiancee traveled to the Markam substation to take pre-wedding photos. 
At the height of 4,300 meters, in front of her future husband's place of work, it's a view found nowhere else in the world.