For the second phase of the operation (adding the 

 telescoping sections), SCUBA equipment was utilized. This 

 gave the divers mobility for the constant ascending and 

 descending required for this task. Freed from the restric- 

 tion of the air hose, a team could complete an assembly in 5 

 to 7 minutes. To avoid decompression stops , divers were 

 replaced after telescoping four sections. During this phase, 

 the support boat was not moored. 



DIVING TIME REQUIRED 



Diving man-hours were logged for each phase of the 

 operation to facilitate accurate estimation of further work 

 of this type. The first phase, surveying and inserting 

 base sections, was completed in 18 working days once the 

 procedures and equipment were standardized. Total diving 

 time for this phase was 81 hours and 27 minutes. Phase 

 two, installation of telescoping sections, was performed 

 in 4 working days with a total of 16 hours and 15 minutes 

 of bottom time. Total diving man-hours required for the 

 completion of the array, therefore, was 97 hours and 42 

 minutes. 



OTHER APPLICATIONS 



Several other applications of this principle have been 

 successfully used at NEL and many more are in formula- 

 tive stages (fig. 7). 



19 



