  F00323/89--OPR-B660-HE; WHILE INVESTIGATING AWOIS NO. 6881, AN UNCHARTED ROCK WAS LOCATED BY SIDE SCAN SONAR. DIVERS DESCRIBE A FIELD OF ROCKS RISING ABOUT 3 FEET FROM THE MUDDY BOTTOM. ONE OF THE LARGER ROCKS WAS A PINNACLE AND A PNEUMO LD OF 20.2 FEE