HB0131 BOHAI SEA SUBMARINE WORK FOR MV ALFIOS IN EAST ANCHORAGE OF QINHUANGDAO PORT FROM 0000UTC TO 1100UTC DAILY FROM 8 TO 12 DEC. ENTERING AND ANCHORING PROHIBITED WITHIN 0.3 MILES RADIUS OF 39-49.75N/119-50.69E. PASS WITH SLOW SPEED. CAUTION ADVISED. HEBEI MSA CHINA.