
 HISTORY
  H10859/99-- OPR-E346-BH; UNCHARTED DANGEROUS SUBMERGED OBSTRUCTION LOCATED BY SIDE SCAN SONAR.  MULTIBEAM DEPTH OF 21 FEET NOT CONSIDERED THE TRUE LEAST DEPTH BY HYDROGRAPHER BECAUSE OF NARROW WIDTH OF PILE.   NO DIVE OPS DUE LOW VIS.  EVAL