PREFACE 



The Naval Civil Engineering Laboratory is conducting a research 

 program to determine the effects of deep ocean environments on mater- 

 ials. It is expected that this research will establish the best mater- 

 ials to be used in deep ocean construction. 



A Submersible Test Unit (STU) was designed, on which many test 

 specimens can be mounted. The STU can be lowered to the ocean floor 

 and remain there for long periods of exposure. 



Thus far, exposures have been made at two deep-ocean test sites 

 and at a surface sea water site in the Pacific Ocean. Six STUs have 

 been exposed and recovered. Test Site I (nominal depth of 6,000 feet) 

 is approximately 81 nautical miles west-southwest of Port Hueneme, 

 California, latitude 33°44'N and longitude 120°45'W. Test Site II 

 (nominal depth of 2,500 feet) is 75 nautical miles west of Port 

 Hueneme, California, latitude 34°06'N and longitude 120°42'W. A sur- 

 face sea water exposure site (V) was established at Point Mugu, 

 California, (latitude 34°06'N and longitude 119°07'W) to obtain sur- 

 face immersion data for comparison purposes. 



This report presents the results of the evaluation of the different 

 alloys exposed at the surface immersion site for a period of 6 months. 



MBL/WHOI 



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