50 



THE NAVY OCEAN ENGINEERING PROGRAM 



400 600 800 



Exposure (days) 



1,000 



1,200 



The statistical median curves for the materials in the bottom sediments at 

 a nominal depth of 5500 ft are the same as those in sea water at this depth. 

 However, the corrosion rates tended to increase slightly in the bottom sedi- 

 ments at the 2350-ft depth. 



Concrete sphere specimen (16-ln. diameter) being lowered into 1 8-in.-diameter 

 pressure vessel at NCEL for hydrostatic tests at an equivalent ocean depth of 

 7000 ft. 



