GD179/21 SOUTH CHINA SEA UNDER WATER OPERATION BY M/V “HAI YANG SHI YOU 287” IN 1000M BOTH SIDES FROM THE LINE JOINING 20-14-45.9N 114-56-27.9E、20-19-06.1N 114-59-15.1E AND 20-19-50.9N 114-59-15.6E FROM 12 AUG. TO 31 DEC. SIGNAL LIGHTS AND SHAPES WILL BE EXHIBITED WIDE BERTH REQUESTED GUANGDONG MSA CHINA