 HISTORY
  H-10623/95-96--OPR-J343-MI/AHP; DIVER INVESTIGATED A CONCRETE BLOCK, .5M OFF THE BOTTOM, 1.5M X .5M W. LEAST DEPTH 49.9 FT.  HYDROGRAPHER/ EVALUATOR RECOMMENDS NOT TO CHART,  NOT CONSIDERED A DANGER TO NAVIGATION.  ENTERED MCR