HB0057 BOHAI SEA SUBMARINE WORK FOR MV ZHONG RAN 36 IN OIL TANKER ANCHORAGE OF QINHUANGDAO PORT FROM 0030UTC TO 1030UTC 11 AND 13 AUG. ENTERING AND ANCHORING PROHIBITED WITHIN 0.3 MILES RADIUS OF 39-53.72N/119-42.74E. PASS WITH SLOW SPEED. CAUTION ADVISED. HEBEI MSA CHINA.