a entry hatch (for coupling 
to submersible) 
siphon 
—— 
ee air or nitrogen 
sediment 
_—S[SSaa 
water being displaced 
liquid nitrogen or 
air evaporating 
Figure 73. Method for initially dewatering entry shaft. 
Future Plans 
For the immediate future, possibly superior systems for sealing and 
dewatering subbottom cavities in rock will be investigated. These available 
techniques will be incorporated into a preliminary design of a complete 
system, which will also include casing and boring techniques. 
REFERENCES 
Anderson, R. E. and Brown, C. L. (1965) Green contaminant in submarine 
hydraulic systems, Navy Marine Engineering Laboratory, Report MEL 51/65. 
Annapolis, Md., May 1965. (AD 464274L) 
Anonymous (1967a) ‘Slippery water used to lubricate pumps,’ Product 
Engineering, vol. 38, no. 15, July 17, 1967, pp. 62, 64. 
95 
