  LNM30/01--CGD8, 7/24/01;  REPORTS A DANGEROUS SUBMERGED OBSTRUCTION, PA, IN LAT. 28/53/39.13N, LONG. 089/23/20.11W (NAD83).  THIS OBSTRUCTION IS REPORTED AS UNKNOWN, IS IN 100 FEET OF WATER WITH AN UNKNOWN AMOUNT OF WATER COVERING IT, AND IS MARKED WIT