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CHAPTER VIH
MEANS OF DEFENSE AGAINST SUBMARINE ATTACK
There as yet seems to have been no really practicable
means devised for defense against the offensive operation
of the submarine. Practically invisible as it is and having
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Submerged run with periscopes exposed. Note disturbance and wake
caused by passage of periscope through the water
the impenetrability of the water for its protection, it is
immune from counter attack. Perhaps the most serious
casualty which it is possible to inflict upon it would be
the chance hitting and destruction of its periscopes when
temporarily exposed above the surface. This of course
would mean that the submarine must remain submerged
hors de combat until nightfall, or else take the conse-
ns