Ill 



face and through the surf zone. The instrument was secured to the 

 cradle and hoisted underneath the top (operator's) platform, (Figure 

 VI-3) . The cable and service box were then brought to the end of the 

 pier. 



On May 14, 1982, the wave activity settled sufficiently to 

 attempt the installation. The CRAB was driven offshore with the 

 instrument and positioned about 200 feet south of the end of the 

 pier. Three divers and a boat operator entered the surf in a Zodiac 

 and motored underneath the pier. The service box, with its 80 feet 

 of unarmored cable secured inside, was lowered into the Zodiac and 

 then motored towards the CRAB — pulling the cable behind it. The 

 service box was carried by a diver below the rear of the CRAB and 

 brought underneath the center of the vehicle. In what became the 

 only difficult phase of the operation, the service box was pushed up 

 into the cradle and the cable mated to the instrument. Large, long 

 period swell made this maneuver both frustrating and often dangerous 

 — as the sharp corners of the cradle feet posed a hazard to the 

 divers. The cable was secured to the bottom of the CRAB using a 

 prussick knot and the vehicle was driven towards the installation 

 site — pulling out the cable. Floats were placed every 80 feet 

 along the cable from the end of the pier. 



