“Jump in!” said Harding.
In a moment the settlers were in the boat. Neb and Ayrton took the oars, Pencroft the rudder. Cyrus Harding in the bows, with the lantern, lighted the way.
The elliptical roof, under which the boat at first passed, suddenly rose; but the darkness was too deep, and the light of the lantern too slight, for either the extent, length, height, or depth of the cave to be ascertained. Solemn silence reigned in this basaltic cavern. Not a sound could penetrate into it, even the thunder peals could not pierce its thick sides.
Such immense caves exist in various parts of the world, natural crypts dating from the geological epoch of the globe.
Some are filled by the sea; others contain entire lakes in their sides. Such is Fingal’s Cave, in the island of Staffa, one of the Hebrides; such are the caves of Morgat, in the bay of Douarucuez, in Brittany, the caves of Bonifacier, in Corsica, those of Lyse-Fjord, in Norway; such are the immense Mammoth caverns in Kentucky, 500 feet in height, and more than twenty miles in length! In many parts of the globe, nature has excavated these caverns, and preserved them for the admiration of man.
Did the cavern which the settlers were now exploring extend to the centre of the island? For a quarter of an hour the boat had been advancing, making détours, indicated to Pencroft by the engineer in short sentences, when all at once—
“More to the right!” he commanded. The boat, altering its course, came up alongside the right wall. The engineer wished to see if the wire still ran along the side. The wire was there fastened to the rock. “Forward!” said Harding.
And the two oars, plunging into the dark waters, urged the boat onwards.
On they went for another quarter of an hour, and a distance of half-a-mile must have been cleared from the mouth of the cave, when Harding’s voice was again heard. “Stop!” said he.