  H6976/45-47WD--WAHI4245; 1:40,000 SCALE SURVEY; VISUAL CONTROL; SUBM. OBSTR.
HUNG AT 21FT; CLEARED BY 20FT; DRAG INDICATED SMALL OBJECTS RATHER THE SHOAL;
CLOSE TO WARTIME MINE FIELD; SUSPECTED THAT OBSTR. IS A MINE ANCHOR OR
LISTENING DEVICE EMBEDD