a half from shore.
"Open the manhole," commanded Mr. Henderson.
Mark sprang up the iron ladder that led to the opening in the deck of the Porpoise and threw back the cams that held the heavy iron in place. Then he swung the cover back and stepped out on the small platform, followed by the professor, Andy and Jack. They looked up to find themselves observed by a curious throng that crowded to the rail of the warship.
[Illustration: A CURIOUS THRONG CROWDED TO THE RAIL OF THE WARSHIP.--Page 28.]
"What are you trying to do? Ram me with a new-fangled torpedo?" asked an angry voice, and a man in a gold laced uniform, who, from his importance plainly showed himself to be the captain of the ship, shook his fist at Mr. Henderson.
"I might ask what right your ship has to get in my path," replied the inventor. "It was all an accident."
"Mighty queer," muttered the naval commander. "Looks very suspicious. How do I know but what you're a torpedo from some foreign nation?"
"Because this is not a torpedo," replied Mr. Henderson. "It is a new submarine boat of my invention, and I was giving it a trial spin."
"I guess you'd better come aboard and do your explaining," went on the captain. "I don't like the looks of things. Lower a boat!" he shouted, "and bring those chaps to my cabin. I want to question them."
It did not suit Professor Henderson to have his plans upset in this fashion. Nor did he care to give a detailed description of his ship to officers of the war department. He had many valuable inventions that were not patented. So he determined to outwit the pompous commander of the cruiser.
The noise made in preparing the small boat for lowering over the side of the big ship could be plainly heard.
"Go below, all of you, and as quietly as you can," whispered Mr. Henderson.
Andy, Mark and Jack obeyed. At that instant the side of the warship was almost deserted, for the sailors who had gathered to observe the Porpoise had gone to lower the small boat.
No sooner had Jack, who was in the rear, disappeared through the manhole than the professor, with a quick jump, followed him.
"Here! Come back!" shouted the warship's captain as he saw Mr. Henderson's head disappearing from view. "Come back I say!"
But with a quick movement the inventor pulled down the manhole cover and clamped it. Then he sprang to the conning tower, and, with a jerk, opened the levers that admitted water to the tanks. The Porpoise began to sink slowly, and then more suddenly, so that, in less than a minute, she was out of sight beneath the waves, and the angry, gold-laced captain was staring in wonderment at the place where the submarine had been. The spot was marked only by a few bubbles and some foam.
"I guess he'll wait some time for an explanation," spoke Mr. Henderson, as he started the big screw and sent the Porpoise ahead at a swift pace.
"That was rather a narrow escape," observed Jack, standing at the foot of the conning tower stairs and talking to Andy and Mr. Henderson, who was steering.
"It certainly was," agreed the professor. "I have not yet become used to seeing things very far ahead in the dimness caused by being under water. But we'll soon get used to it. Luckily, the Porpoise was not damaged by the shock."
For several hours the Porpoise was kept on her course. She behaved handsomely, and nothing excepting slight and easily remedied defects were found. The professor steered well out to sea, increasing both the forward speed and the depth to which the vessel sank. Presently the craft came to a stop with a little jolt.
"What's the trouble?" asked Mark, somewhat alarmed.
"Nothing at all," replied the professor with a smile, as he stepped out of the conning tower and entered the engine-room. "I thought it was time for dinner so I stopped the ship. We are now resting on the ocean bed, about half a mile below the surface. Look!"
As he spoke he slid back the slides covering the plate glass windows. The boys saw that the ship rested in the midst of an immense forest of sea weed. Some of the stalks were as large around as trees. In and out among the snake-like, waving branches swam big fishes. It was a weird, but beautiful sight.
"Come, Washington, serve dinner," ordered Mr. Henderson, and the colored man soon had a good meal prepared. Few repasts have been eaten under such strange circumstances.
Desiring to be back at his secluded dock by nightfall, Captain Henderson soon started the Porpoise up again. Without any accidents the return trip was made and by nine o'clock the Porpoise rode safely at the dock where she had been launched.
The
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