The Mysterious Island Jules Verne (red white royal blue txt) 📖

iron by means of a vegetable fibre to an upright post, so as to have the iron hang directly over the hole. Another long fibre, previously soaked in sulphur, was to be fastened to the middle of the first and laid along the ground many feet from this excavation. The fire was to be applied to this second fibre, it would burn till it reached the first and set it on fire, then the latter would break and the iron be precipitated upon the nitroglycerine.

The apparatus was fixed in place; then the engineer, after having made his companions go away, filled the hole so that the fluid overflowed the opening, and spread some drops underneath the mass of suspended iron.

This done, Smith lit the end of the sulfured fibre, and, leaving the place, returned with his companions to the Chimneys.

Twenty-five minutes after a tremendous explosion was heard. It seemed as if the whole island trembled to its base. A volley of stones rose into the air as if they had been vomited from a volcano. The concussion was such that it shook the Chimneys. The colonists, though two miles away, were thrown to the ground. Rising again, they clambered up to the plateau and hurried towards the place.

A large opening had been torn in the granite coping. A rapid stream of water escaped through it, leaping and foaming across the plateau, and, reaching the brink, fell a distance of 300 feet to the shore below.

XVIII

Pencroff doubts no more⁠—the old outlet of the lake⁠—A subterranean descent⁠—The way through the granite⁠—Top has disappeared⁠—The central cavern⁠—The lower well⁠—Mystery⁠—The blows with the pick⁠—The return.

Smith’s project had succeeded; but, as was his manner, he stood motionless, absorbed, his lips closed, giving no sign of satisfaction. Herbert was all enthusiasm; Neb jumped with joy; Pencroff, shaking his head, murmured:⁠—

“Indeed, our engineer does wonders!”

The nitroglycerine had worked powerfully. The opening was so great that at least a three times greater volume of water escaped by it than by the former outlet. In a little while, therefore, the level of the lake would be lowered two feet or more.

The colonists returned to the Chimneys, and collecting some picks, spears, ropes, a steel and tinder, returned to the plateau. Top went with them.

On the way the sailor could not resist saying to the engineer:⁠—

“But do you really think, Mr. Smith, that one could blow up the whole island with this beautiful liquid of yours?”

“Doubtless,” replied the other, “island, continents, the world itself. It is only a question of quantity.”

“Couldn’t you use this nitroglycerine to load firearms?”

“No, Pencroff, because it is too shattering. But it would be easy to make guncotton, or even common powder, as we have the material. Unfortunately, the guns themselves are wanting.”

“But with a little ingenuity!⁠—”

Pencroff had erased “impossible” from his vocabulary.

The colonists, having reached Prospect Plateau, hastened at once to the old outlet of the lake, which ought now to be uncovered. And when the water no longer poured through it, it would, doubtless, be easy to explore its interior arrangement.

In a few moments they reached the lower angle of the lake, and saw at a glance what the result was.

There, in the granite wall of the lake, above the water-level, appeared the long-looked for opening. A narrow ledge, left bare by the subsidence of the water, gave them access to it. The opening was twenty feet wide, though only two feet high. It was like the gutter-mouth in a pavement. It was not open enough for the party to get in, but Neb and Pencroff, with their picks, in less than an hour had given it a sufficient height.

The engineer looked in and saw that the walls of the opening in its upper part showed a slope of from 30° to 35°. And, therefore, unless they became much steeper, it would be easy to descend, perhaps, to the level of the sea. And if, as was probable, some vast cavern existed in the interior of the massive granite, it was possible that they could make use of it.

“What are we waiting for, Mr. Smith,” cried the sailor, all impatience to begin the exploration, “Top, you see, has gone ahead!”

“We must have some light,” said the engineer. “Go, Neb, and cut some resinous branches.”

The negro and Herbert ran to some pine and evergreens growing upon the bank, and soon returned with branches which were made into torches. Having lit them, the colonists, with Smith leading, entered the dark passage, but recently filled with water.

Contrary to their expectation, the passage grew higher as they advanced, until soon they were able to walk upright. The granite walls, worn by the water, were very slippery, and the party had to look out for falls. They, therefore, fastened themselves together with a cord, like mountain climbers. Fortunately, some granite steps made the descent less perilous. Drops of water, still clinging to the rocks, glistened like stalactites in the torchlight. The engineer looked carefully at this black granite. He could not see a stratum or a flaw. The mass was compact and of fine grain, and the passage must have been coeval with the island. It had not been worn little by little by the constant action of water. Pluto, and not Neptune, had shaped it; and the traces of igneous action were still visible upon its surface.

The colonists descended but slowly. They experienced some emotion in thus adventuring into the depths of the earth, in being its first human visitants. No one spoke, but each was busied with his own reflections and the thought occurred to more than one, that perhaps some pulp or other gigantic cephalopod might inhabit the interior cavities which communicated with the sea. It was, therefore, necessary to advance cautiously.

Top was ahead of the little troop and they could rely on the dog’s sagacity to give the alarm on occasion. After having descended a hundred feet, Smith halted, and the others came up with him. They were standing in a cavern of