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DESIGN OF THE SUBMARINE TORPEDO BOAT 109
feature to have a whistle or signal device included in order
to attract attention to the buoy.
Finally, external air connections on the hull should be
had and located so as to be easily accessible for a diver to
attach thereto an air hose from the surface.
Suitably strengthened holes fore and aft in the super-
structure for attaching hoisting slings, and towing shackles
at the bow or the equivalent should be provided. In fact
in a vessel of this type it is absolutely essential that every
means be taken to prevent accident, and adequate means
provided to save both the crew and the vessel in case
accident does happen.