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, two deep-ocean test sites in the Pacific Ocean have 

 been selected. 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 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 titanium 

 and titanium alloys exposed at the above three test sites. Also, 

 some information from TOTO is included for comparative purposes. 



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