HB0111 BOHAI SEA SUBMARINE WORK FOR MV XINHAITONG3 IN WEST ANCHORAGE OF QINHUANGDAO PORT FROM 0030UTC TO 1130UTC DAILY FROM 3 TO 4 SEP. ENTERING AND ANCHORING PROHIBITED WITHIN 0.3 MILES RADIUS OF 39-51.32N/119-37.95E. CAUTION ADVISED. HEBEI MSA CHINA.