  CL281/67--HELICOPTER COMBAT SUPPORT SQUAD. 4, NORFOLK NAVAL AIR STATION: MINESWEEPING GEAR SNAGGED SUBM. OBSTR. GEAR NORMALLY RUNS BETWEEN 13 AND 15 FT. BELOW SURFACE. 2000 POUNDS OF TENSION WAS APPLIED FOR 15 MIN. IN AN ATTEMPT TO DISLODGE GEAR. SUBST