Figure 19. NCEL STU. 



Estimates of total settlement were determined from mudline markings 

 on test specimens. Total penetration values varied between negligible and 8 

 inches. No distinctions could be made between dynamic, immediate, and 

 long-term settlement processes. 



Naval Research Laboratory STUs. In 1961 , a cooperative program of 

 deep-sea test panel exposures was initiated in TOTO by the Naval Oceano- 

 graphic Office, the Naval Research Laboratory, and the Naval Underwater 

 Ordnance Station (De Palma, 1962 and 1969; Hersey, 1969). Three test units 

 were placed in 5,800 feet of water about 3 miles off Andros Island, in the 

 Bahamas. The 200- to 300-pound pyramidal arrays, supported on a silt-size 

 calcareous ooze, were constructed of 1 -inch-diameter pipe with a 6-foot- 

 square base. Of the three units placed in the spring of 1962, one was 

 recovered 3 months later, another 34 months later, and the last has yet 

 to be recovered. Settlement for the two recovered arrays was thought to 

 be less than 1 foot, since test plates located above that elevation showed no 

 effects from burial in the sediment. 



33 



