  LNM 34/77, 8/10/77;  REPORTS THE DANGEROUS SUNKEN WRECK, PA, OF THE 150FT FUEL BARGE "BIG MAC" IN LAT. 29/07 N, LON. 91/41 W (NAD27). BARGE REPORTEDLY LOADED WITH 100,000 GALLONS OF DIESEL FUEL OIL.  SALVAGE OPERATIONS ARE IN PROGRESS. (ENTERED BY KRW