Staff members work at the control room on Tian Kun Hao, a Chinese-built dredging vessel, the largest of its kind in Asia, June 7, 2018. Tian Kun Hao, constructed by Tianjin Dredging Co. Ltd., a subsidiary of China Communication Construction Co., Ltd. (CCCC), finished its first sea trial. The 140-meter-long vessel, with the designed capacity to dredge 6,000 cubic meters per hour, can dig as deep as 35 meters under the sea floor. (Xinhua/Mao Zhenhua)