DEEP-OCEAN BIODETERIORATION OF MATERIALS - PART VI. ONE YEAR AT 

 2,370 FEET 



Technical Report R-525 



Z-FO 15-0 1-99-006 



by 



James S. Muraoko 



ABSTRACT 



As Part VI of a series of reports on the biological deterioration of materials in 

 the deep ocean, this report covers the data obtained after exposing metallic and 

 nonmetalllc specimens for 13.4 months on the floor of the Pacific Ocean at a depth 

 of 2,370 feet (Test Site II). The specimens were attached to a Submersible Test Unit 

 that was emplaced in April 1965 and retrieved In May 1966. Preliminary examination 

 of the specimens was made aboard ship, and the final examination, tests, and analyses 

 were performed at the Naval Civil Engineering Laboratory. 



On recovery, most of the plastic materials and all of the rope specimens were 

 covered with bacterial slime. Cotton and manila ropes were severely deteriorated 

 by marine microorganisms. Wood panels, certain plastics, and manila ropes were 

 attacked by moliuscan borers. Some of the plastics were attacked by borers directly 

 from seawater environment without the aid of wood bait pieces. Hydroids and tube- 

 worms were found on metal panels. Sea anemone, snails, and crabs were also found 

 attached to various test panels. The surface of a silicone rubber electrical cable 

 insulation was deteriorated by some marine organisms. Typical fouling organisms 

 such as barnacles and bryozoa were not found. Glass, elastomers, and certain 

 plastics were not adversely affected. Data from evaluation of these specimens are 

 presented. 



Distribution of this report is unlimited. 



Copies available at the Clearinghouse for Federal 



Scientific & Technical Information (CFSTI), Sills Building, 



5285 Port Royal Road, Springfield, Va. 22151 



Price. $2.00 



The Laboratory invites comment on this report, particularly on the 

 results obtained by those who have applied the information. 



