  F00388/94-- OPR-E696-HE; OBSTRUCTION LOCATED BY SIDE SCAN SONAR. LD (PNEUMO) OF 6.3METERS (20 FEET) IN LAT. 36-57-48.666N,  LONG. 76-10-32.694W. DIVERS DESCRIBE A 2X2X2 FOOT CONCRETE BLOCK. EVALUATOR RECOMMENDS CHARTING A 20 OBSTN AS SURVEYED. (ENT 3/2