Staff members stand on an elevating machine to get onto the Dagu lighthouse, which stands 12.9 nautical miles east of the Tianjin Port of north China's Tianjin Municipality, on Feb. 5, 2021.

Aerial photo taken on Feb. 5, 2021 shows the Dagu lighthouse which stands 12.9 nautical miles east of the Tianjin Port of north China's Tianjin Municipality.

Li Hongqi stands on deck as approaching the Dagu lighthouse, which stands 12.9 nautical miles east of the Tianjin Port of north China's Tianjin Municipality, on Jan. 20, 2021. The 38.3-meter-high Dagu lighthouse with a light range of 17 nautical miles, has been put into use since May 1, 1978.

Photo taken on Feb. 5, 2021 shows the Dagu lighthouse which stands 12.9 nautical miles east of the Tianjin Port of north China's Tianjin Municipality. The 38.3-meter-high Dagu lighthouse with a light range of 17 nautical miles, has been put into use since May 1, 1978. Li Hongqi, 47, is a keeper of Dagu lighthouse. Keepers here work in a month-long rotation, maintaining lights of the lighthouse to guarantee safe navigation of ships. (Xinhua/Zhao Zishuo)