"Admiral O'Neill of the United States navy has been pouring cold water once more on submarine enthusiasts. He points out that a few years ago torpedo craft were the "only things necessary" - now it is submarines, none of which have as yet got beyond the experimental stage. The experiments, too, so far as we can see, have not yet been of a practical nature, the problem being not one of flotation and immersion, but of practical application for war uses."