HB0129 BOHAI SEA SUBMARINE WORK FOR MV TRITON SWALLOW IN WEST ANCHORAGE OF QINHUANGDAO PORT FROM 0030UTC TO 1100UTC DAILY FROM 4 TO 5 DEC. ENTERING AND ANCHORING PROHIBITED WITHIN 0.4 MILES RADIUS OF 39-48.65N/119-37.27E. PASS WITH SLOW SPEED. CAUTION ADVISED. HEBEI MSA CHINA.