"It will be only a matter of a very few days at the most until you chaps will be down here as workmen instead of guests, and you might as well get acquainted with the new boat and learn everything about her you can," the executive had told them. Needless to say, they were more than taking it all in; they were acclimating themselves to the very best of their versatile natures. It was marvelous how well the craft could be handled. The telephone kept them constantly in touch with the mother ship. In case they wanted to stop or start suddenly, it was not necessary to wait for the telephone. An electric buzzer rung in accordance with a pre-arranged code of signals told the engineer just what to do. By now the aquascope, or windowed floor, of the _Nautilus_ was poised directly over the bow of the lost sub-chaser. By moving the chamber slightly to the left it was possible to lower away toward the bottom until the name of the lost craft might be noted from the ports of the _Nautilus_. "Drop her down gradually now and I'll keep a sharp lookout," said the superintendent, at the same time directing Dick to take his position at the other port and likewise to pay all attention toward finding the telltale mark of the supposed submarine chaser, E-70, on the starboard side of the bow. Jay remained by the side of Captain Austin. "This is one thing you want to learn well in advance and to keep constantly in mind," the ship's executive cautioned as he signaled the _Jules Verne_ to swing the _Nautilus_ lower in the water. What the captain had in mind was the equalizing of pressures. Every time the _Nautilus_ was lowered deeper in the water it was necessary to take a greater air pressure into the big diving chamber before the aquascope could be raised. The depth always showed on the depth-dial. Also the amount of air in the chamber was registered by a clock-like gauge. In a crevice on the steel wall hung a small framed schedule under glass showing the air pressure necessary to suit varying depths. As yet the process had not been made automatic. The engineer had to keep this whole proposition constantly in mind. "See anything yet, Montey?" the captain asked of the superintendent as the _Nautilus_ dropped slowly away into the depths. Nothing by way of identification was yet discernible, even though the superintendent had turned on the powerful submarine searchlights with which the _Nautilus_ was equipped, and, with the assistance of Jay, was sweeping the sides of the derelict. For several minutes they cast about in the water, when of a sudden Jay exclaimed eagerly: "Hold right there." Instantly Captain Austin checked the movement of the diving outfit. "There! That looks like E-70 to me," exclaimed Jay. The superintendent moved over beside him and as Jay withdrew from his port station peered out through the water.