An engineer repairs an offshore turbine at the H8-2 wind farm in East China’s Jiangsu province. He is one of 19 engineers that spend most of their time at sea, operating and maintaining the site — China’s farthest offshore wind farm in operation at 72 kilometers (roughly 45 miles) off the coastline. Photo: Chen Liang/Caixin

Engineers open the door into a wind turbine. Inside they will attach a lock hook to themselves and be pulled up to the top by an elevator-like device. Photo: Chen Liang/Caixin

Wires and pipelines run through the wind farm’s offshore converter station. According to China Three Gorges Renewables Group Co. Ltd., the converter station is the first in Asia and the largest in the world — with an area roughly equal to a soccer field and the height of a 15-story building. Photo: Chen Liang/Caixin

The condition of each turbine can be monitored on a computer screen in the offshore converter station’s control center. Photo: Chen Liang/Caixin

An engineer opens a bucket of lubricating oil for a wind turbine. Photo: Chen Liang/Caixin

Two engineers leave the wind turbine under the searchlight of the vessel where they usually stay at night. Photo: Chen Liang/Caixin

A so-called “frogman” prepares to dive to deal with fishing nets and ropes entangled in the vessel propeller. Photo: Chen Liang/Caixin

China Mobile workers test network signals on the vessel with cell phones. There is a signal most of the time despite being far offshore. Photo: Chen Liang/Caixin

Engineers practice firefighting in a gym onshore. Photo: Chen Liang/Caixin

Engineers practice first aid. Photo: Chen Liang/Caixin

An engineer picks up his packages while back onshore on a break. Photo: Chen Liang/Caixin

Two engineers compare their seascape photos when back onshore. Photo: Chen Liang/Caixin

Photos of the engineers and their loved ones decorate a notice board. Photo: Chen Liang/Caixin

The sun rises over the wind farm. Photo: Chen Liang/Caixin