DEEP-OCEAN BIODETERIORATION OF MATERIALS — PART III]. THREE YEARS AT 
5,300 FEET 
Technical Report R-428 
Y-RO11-01-01-042 
by 
James S, Muraoka 
ABSTRACT 
This is Part II of a series of reports on the biological deterioration of materials 
in the deep ocean. It covers the data obtained after exposing 1,318 test specimens 
of 316 different materials for 35 months on the Pacific Ocean floor at a depth of 
5,300 feet (Test Site 1). The materials were attached to a Submersible Test Unit (STU). 
The STU was retrieved in February 1965 and returned to the Laboratory for tests and 
analyses, 
Hydroid growths were found on all the test specimens placed on the STU. A few 
species of tube worms were found attached to metals, plastics, and coated test speci- 
mens. Most of the plastics and all the rope materials were covered with bacterial 
slime growth, Cotton and Manila rope specimens were severely deteriorated by bac- 
terial action. Wood panels, plastics, and Manila ropes were attacked by marine borers. 
Metals, natural and butyl rubber, and certain plastic materials were not affected. 
Distribution of this document is unlimited. 
Copies available at the Clearinghouse (CFST1!) $3.00 
The Laboratory invites comment on this report, particularly on the 
results obtained by those who have applied the information. 
