HB0124 BOHAI SEA SUBMARINE WORK FOR MV HUAHAO57 IN WEST ANCHORAGE OF QINHUANGDAO PORT FROM 280430UTC TO 281100UTC NOV. ENTERING AND ANCHORING PROHIBITED WITHIN 0.4 MILES RADIUS OF 39-50.85N/119-37.97E. PASS WITH SLOW SPEED. CAUTION ADVISED. HEBEI MSA CHINA.