ScientificAmerican1920-09-25.jpg Scientific American 1920-09-18ThumbnailsScientific American 1920-10-02Scientific American 1920-09-18ThumbnailsScientific American 1920-10-02Scientific American 1920-09-18ThumbnailsScientific American 1920-10-02Scientific American 1920-09-18ThumbnailsScientific American 1920-10-02

Submarine S-5 signalling for help through a hole cut in the stern.