5. Drill through each of the 10 holes to the sea water and 

 free the "island," with an ice spud if necessary. 



6. Remove the ice "island" and clear the slush. 



The ice auger used would drill a 52" hole, 7" in diameter in 20 

 seconds. The engine operated at temperatures to -27°F with slight 

 choke adjustment si. When extensions were used to drill a hole great- 

 er than 32" deep, the auger hecame difficult to manage. The tech- 

 nique was successfvil in ice varying in thickness from 2l" to W. 

 The auger was also used to make single 7" diameter holes in 65" of 

 ice. 



The current data was obtained with two types of cinrent meters: 

 the Hydroproducts Model 501B, and the Geodyne Model A-101. 



The Hydroproducts Model 501B meter is a self contained system 

 with an integral recorder capable of unattended recording of cur- 

 rent speed, ciorrent direction, and temperature for periods up to 50 

 days. The record is a permanent and easy to read analog plot that 

 can be analyzed immediately after recovery of the meter. The Hydro- 

 products meters were used to obtain a 2k hovir current record at each 

 site. The records were analyzed as soon as possible after recovery 

 of the meters to provide the on-site SAC Disaster Control Team with 

 immediate information on the surface cvirrents in the vicinity of the 

 crash site. Surface current measurements with the Hydroproducts 

 meters were made at sites inaccessible to the R/V THULE. Figure 6 

 shows this phase of the field operation. The Hydroproducts meter 

 is in the foregroimd. 



The Geodyne Model A-101 is a self contained system capable of 

 recording up to 200 days of cttrrent speed and direction data. The 

 data are recorded as a digital coded dot matrix on photographic 

 film. The Geodyne meters were used to obtain a seven-day current 

 record from five different depths at Site 1. These data were not 

 processed until the field team returned to NAVOCEANO where the neces- 

 sary data processing facilities were available. The Geodyne current 

 meter array is shown in Figure 7« Since the array was to be em- 

 placed for seven days and since the Geodyne meters are rather deli- 

 cate, they were transported to Site 1 by a helicopter which happened 

 to be available (Figure 8). 



Both the Hydroproducts and Geodyne cxirrent meters use a magnetic 

 compass in determining current direction. The crash site was located 

 close to the earth's north magnetic pole where the horizontal com- 

 ponent of the earth's magnetic field is very weak, and the vertical 

 magnetic force is relatively strong. The weak horizontal and strong 

 vertical magnetic forces acting on the compasses in the current 

 meters suggested difficulty in measuring current directions. To 

 overcome this diff icxolty, one Hydroproducts meter was modified to 

 measure current direction by referencing the compass to an artificial 



322 



