HB0104 BOHAI SEA SUBMARINE WORK FOR MV ZHEHAI526 IN EAST ANCHORAGE OF QINHUANGDAO PORT FROM 0000UTC TO 1000UTC DAILY FROM 20 TO 21 AUG. ENTERING AND ANCHORING PROHIBITED WITHIN 0.3 MILES RADIUS OF 39-47.06N/119-47.12E. CAUTION ADVISED. HEBEI MSA CHINA.