Captain Lyu Liangpeng of the freighter "Jinhaifa" makes a video call to family before setting off at the Nanjing Port of the Tianjin Harbour, north China, June 18, 2018. Cell phone signals remain low in most of the sailing time on the sea. The freighter "Jinhaifa" ships bulk coal between harbours in north China and Quanzhou in southeast China's Fujian Province. Seafarers on the freighter usually spend 6 to 8 months working and living on the sea then have two to four months' rest. June 25 marked the Day of the Seafarer. There had been 1.483 million registered seafarers in China by the end of 2017. (Xinhua/Cai Yang)