"No," cried Carl Baldwin, "you shall not go mad, nor even yield to despair, for we will yet save her. The Professor shall go with us, and we will take the Mermaid. Even now he is inclined to consider some such undertaking. And when he reads this message he will be as ready to set forth as you or I. Oh yes, my dear fellow, we can rescue her and we will. Instead of going to a penal colony, she shall come to this country, and be as free as you are at this moment."
As he spoke the young American seized his friend's hand, and the latter looking into the brave blue eyes, now blazing with excitement, believed that Catina would be saved.
CHAPTER II
The submarine boat Mermaid was a cigar-shaped shell of aluminium bronze, extremely light and strong, about forty feet in length and eight in greatest diameter. On its upper side was a small railed platform or deck, from the centre of which rose a low turret provided with four bull's-eyes, from which an observer might glance out ahead, astern, or on either side. Another bull's-eye was fitted into the hinged and water-tight cap that closed the turret when the boat was submerged.
The interior of the boat was divided into three compartments. Of these, the one farthest forward was fitted with an air-lock, through which a person wearing a diver's suit might leave the vessel while she was under water and return to her at will. This hold was also pierced for a bull's-eye through which could be made to shine an electric search light of intense power.
The central compartment was the living and operating room. It also contained a dynamo, an air compressor, and a small condenser, by means of which sea-water could be made drinkable. In the after compartment was located a compact but powerful gasoline engine. This furnished the motive power for running on the surface, and also stored electricity by which the screw could be turned when surface air was no longer available. Beneath the floor of the central compartment was a tank for water ballast, which could be filled or emptied at will of the operator. In all parts of the boat were hundreds of tubes, wires, cocks, valves, and other devices of amazing ingenuity for ensuring the safety of her crew and the discomfiture of an enemy.
She was indeed, as Carlos Moranza had said, one of the crowning scientific marvels of the century. On the day succeeding that of her trial trip, the young Cuban was full of hope and courage, for Professor Rivers had been won to his cause by the enticing prospect of achieving the rescue of a young girl from a dreadful fate, and at the same time testing under most trying conditions the powers of his beloved boat. He had only stipulated that she should not be used for the destruction of either life or property.
Thus it happened that in less than a week one of the most powerful tugs on the Delaware cleared for Havana. She had in tow a great dumping scow, such as is used in New York harbour for conveying the city garbage far out to sea. This scow was built with a long central pocket, the bottom of which was longitudinally divided into two parts. Each of these was hung on massive hinges, and could be made to drop or open outward, thus allowing the contents of the pocket to fall into the sea. Then, by means of a donkey-engine, the great valves could be drawn up and closed as before.