Tom entered the lower pilot house, and turned the valve that opened the tanks. He also pulled the lever that started the pumps, so that the water ballast would be more quickly emptied, as that would render the submarine buoyant, and she would quickly shoot to the surface. To the surprise of the lad, however, there followed no outrushing of the water. The Advance remained stationary on the ocean bed. Mr. Swift looked up from his notes.
"Didn't you hear me ask you to send her up, Tom?" he inquired mildly.
"I did, dad, but something seems to be the matter," was the reply.
"Matter? What do you mean?" and the aged inventor hastened to where his son and Captain Weston were at the wheels, valves and levers.
"Why, the tanks won't empty, and the pumps don't seem to work."
"Let me try," suggested Mr. Swift, and he pulled the various handles. There was no corresponding action of the machinery.
"That's odd," he remarked in a curious voice, "Perhaps something has gone wrong with the connections. Go look in the engine-room, and ask Mr. Sharp if everything is all right there."
Tom made a quick trip, returning to report
