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Page:Popular Science Monthly Volume 89.djvu/819

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Si.o-nalino- for Help with Flashlig'ht Buoys

��AIR-HOLES

���DISTRESS SIGNALS

��BUOY

���AIR-HOLES

���FLEXIBLE HOSE

���CABLE- ROPE

g^TORAGE

���The crew get into the compartments and release the buoys. Until their distress signals are answered, they receive a supply of fresh air through the hose attached to the buoys. On the arrival of a salvaging ship, the submarine is hauled up by means of the cables and the men are freed

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