"A great Admiral just before the war," said the inventor, "declared that the future of naval warfare lay under the water, and not on the surface, as we have always believed. He was right. But he did not go as far as he might have gone. The _whole future of shipping_ lies as much under water as on the surface. I tell you, gentlemen, that this boat, here, will afford untold blessings to humanity. To an island country it affords--existence. Think. This country, Britain, is not self-supporting. Is it not so? It could not keep its people alive for more than months. It depends upon supplies from all ends of the earth. All roads upon the high seas lead to Britain. And every helpless surface vessel, carrying life to the island people at home, is a target for the long-distance submarine. If an enemy possesses a great fleet of submarines he does not need to declare a war area about these shores. Every high sea is a war area where he can ply his wanton trade. With the submarine as perfect as it is to-day, Britain, great as she is in naval armaments, can never face another war successfully. _That thought is in the mind of all men already_." The man paused deliberately. Then with a curious foreign gesture of the hands he went on. "But there is already established an axiom. Submarine cannot fight submarine--under the surface." He shrugged. "It is so simple. How can an enemy attack my submersible? The moment a submarine appears, the submersible submerges and the enemy is helpless. An aerial warship will become a spectacle for the amused curiosity to the ocean traveller. In peace time storms will have small enough terror, and on the calm summer seas we shall speed along at ever-increasing mileage. I tell you, gentlemen, the days of wholly surface boats are gone. The days of clumsy blockades are over, just as are the starvation purposes of contraband of war. With the submersible how is it possible to prevent imports to a country which possesses a seaboard? That is the proposition I put to the world in support of my submersible." Father and son sat silently listening to the easy, brief manner of the man's explanation. Nor was it till he spoke of the futility of a war submarine's efforts against his submersible did any note of passion and triumph find its way into the man's manner. At that point, however, a definite uplifting made itself apparent. His triumph was in the new depth vibrating in his musical voice. There was a light in his eyes such as is to be found in the triumphant gaze of the victor.