ICE 



The types and the extent of ice in the Chukchi Sea were 

 determined by means of observations made from the USS 

 NEREUS (AS17), the USS BOARFISH (SS327), the USS CHUB 

 (SS329), the USS CABEZON (SS334), and the USS CAIMAN 

 (SS323). The southern limit of floating ice was plotted from 

 observations made by each ship. A composite of these plots 

 is presented in figure 52. 



The USS NEREUS reached the southern limits of the 

 floating ice (latitude 72°02' N, longitude 168°53'W) at 0930 

 LCT on 1 August. Brash and block ice were encountered, 

 but since the ice covered less than 10 per cent of the sea 

 surface, there remained sufficiently large spaces of water 

 for navigation. Proceeding in a northerly direction, the 

 USS NEREUS reached a point about 2 miles beyond the southern 

 ice limits at 1000 LCT of the same day. The scattered ice 



168 00' 167" 00' 166 00' 165° 00' 



164° 00' 163° 00' 162° 00' 161 ° 00' 



168 00' 167 00' 166° 00' 165° 00' 



iiiiiiiniiiHi 



164' 00' 163° 00' 162° 00' 161° 00' 



Figure 52. Composite chart of southern limit of arctic ice pack as observed by the four submarines and 

 tender, 1 to 6 August 1947. Small numbers indicate day of month. 



7 V 



