Five Thousand Miles Underground; Or, the Mystery of the Centre of the Earth — Story, Setting & Ideas

a sea of boiling water and imprisoned between big fields of ice.

By means of strong diving suits they were able to leave the ship and walk about on the bottom of the sea. They visited a graveyard of sunken ships, saw many strange monsters as well as many beautiful fish in the great depths to which they sunk. Many times they were in dire peril but the resources of the professor, the bravery and daring of the boys, no less than the help Washington and Andy Sudds, the hunter, rendered at times, brought them through.

Those of you who read of their adventures will recall the strange island which they came upon in the Atlantic Ocean, far from the coast of South America.

When they first drew near this island they were almost sucked into the depths of a great whirlpool, caused by water pouring down a big hole that seemed to lead far into the earth. They reversed their ship just in time.

But, on going to another side of the island they were able to approach safely, as at this point the great hole was farther from the shore. Then they landed and investigated.

They found the island was almost circular, and the hole was also round, but not in the center of the land. It was an immense cavity, so wide they could not see across, and as for the depth they could only guess at it. Looking down they could only see rolling masses of vapor and clouds caused by the water which poured down from the ocean with the force of a Niagara.

Gazing down into the big hole Mark suggested it might lead to the centre of the earth, which some scientists claim is hollow. The professor admitted that the cavity looked as though it led to China.

They had no means of investigating further the mystery of the opening and returned to their submarine, completing the voyage to the south pole.

It was now about two years since they had come back from that eventful trip. One of the first things the professor did, after docking the _Porpoise_, was to shut himself up in his study and begin to draw plans. To the questions of the boys he returned no answer for several days. Then he announced he was working on a craft which could both sail on top of the water and navigate the air.

In time the plans were done, and, in order to keep the work secret, the shop was moved to an island which the professor owned.

Parts of the _Monarch_ and the _Porpoise_ were used in constructing the new craft, so there was no need to get other help than that which the boys, Washington and Bill and Tom could give, since the two latter accepted an offer of the professor to remain and work for him. The boys, of course, would not leave their friend.

The professor realized that he had a more difficult task in his new venture than he had set himself on other occasions. For a ship to be light enough to rise in the air, and, at another time, and with no change, to be strong enough to navigate the ocean, was indeed something to tax Mr. Henderson’s ingenuity.

However, in the course of a little over a year the larger part of the work was done. Inside the big shed was the huge affair which, it was hoped, would enable its owner to be master of both air and water.

“Did the professor say anything special?” asked Mark of Washington.

“Nope. I reckon he were too busy problamatin’ the exact altitude projected in an inverse direction by th’ square root of th’ new engine when operated at a million times inside of a few seconds, but he didn’t say nothin’ t’ me. I were busy underneath th’ ship, fixin’ bolts when he tole me t’ find yo’. I wouldn’t be s’prised if he had th’ thing goin’ soon.”

“Do you think he’ll be generating the new gas to-day?” asked Jack eagerly. “That’s the most troublesome part; to get that gas right.”

“He didn’t say nothin’ t’ me 'bout it,” Washington stated, as he walked along beside the two boys. “He jest seemed anxious like.”

“We’d better hurry,” advised Mark. “He may be at an important part in his experiments and probably needs us. I hope it will work. He has spent many days on it, and we all have worked hard. It ought to be a success.”

“Perfesser allers makes things work,” declared Washington stoutly.

“That’s a good way to feel about it, anyway,” observed Mark. “Well, we’ll soon know.”