PREFACE 



The U. S. Naval Civil Engineering Laboratory is conducting a 

 research program to determine the effects of deep ocean environments 

 on materials. It is expected that this research will establish the 

 best materials 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 left 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 33044'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 surface sea 

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

 (34°06'N - 119°07'W) to obtain surface immersion data for comparison 

 purposes . 



This report presents the results of the evaluations of copper and 

 copper alloys exposed at the above three test sites. 



