HB0121 BOHAI SEA SUBMARINE WORK FOR MV MINGZHOU62 IN WEST ANCHORAGE OF QINHUANGDAO PORT FROM 0030UTC TO 1100UTC DAILY FROM 24 TO 29 NOV. ENTERING AND ANCHORING PROHIBITED WITHIN 0.5 MILES RADIUS OF 39-45.47N/119-40.00E. PASS WITH SLOW SPEED. CAUTION ADVISED. HEBEI MSA CHINA.