HB0053 BOHAI SEA SUBMARINE WORK FOR MV ZHONG CHANG ZHOU SHAN IN EAST ANCHORAGE OF QINHUANGDAO PORT FROM 030600UTC TO 031000UTC AUG AND FROM 0100UTC TO 1000UTC DAILY FROM 4 TO 5 AUG. ENTERING AND ANCHORING PROHIBITED WITHIN 0.5 MILES RADIUS OF 39-49.93N/119-50.39E. PASS WITH SLOW SPEED. CAUTION ADVISED. HEBEI MSA CHINA.