Submarines, Mines and Torpedoes in the War

In the mist of war which envelops over half the entire world, no less than 264 underwater fighting ships are engaged. They form the submarine fleets of England, France, Russia, Japan, Germany and Austria; and the highly-trained crews of these modern additions to the fighting navies comprise nearly 20,000 men. But the conduct of submarine warfare on the grand scale requires far more than flotillas of submergible warships and their daring crews. This new branch of naval science is ever widening in...