PBEFACE 



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

 research program to determine the effects of deep ocean environ- 

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

 the best materials to be used in deep ocean structures. 



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 34O06'N 

 and longitude 120^42 'W, 



This report presents the results of the evaluation of nickel 

 and nickel alloys. 



