"I am very glad you brought my knapsack, Graham," said the Doctor, "as it contains my electric lamp. We will now go further into the cave, as it is important that we should know the extent of our resources when the hour of need comes."
By the light from wax tapers, burnt one after the other, we got the package undone, and soon had the lamp in working order. Its brilliant rays lit-up the cavity so well that we could see many yards before us. The Doctor led the way, lamp in hand, and following him, we climbed down deeper and deeper, and further and further, into the very bowels of the dead volcano. The cavern now began to reach an enormous size, and our light was powerless to pierce the great blackness around us, comparatively speaking, for any distance. At first the lamp illuminated the rugged walls of this ancient furnace, and the rocks, in every conceivable fantastic shape, looked grim and ghostly in the blue electric light; but as we went on and on these jagged cliffs, moulded by the molten fires of long-passed ages, gradually receded from the penetrating light, until at last the rough ground beneath us was all that was visible, and the vast immeasurable dome of the extinct crater loomed in dark weird mystery around us, our lamp but as a feeble star within its profound unknown depths. We must have travelled nearly a mile into the mountain, when we were surprised beyond measure to see the starry vault of heaven through a vast rent in the top of the cavern, thousands of feet above our heads. The crater, the entire mountain, was hollow, and the hole in the shell above us had been the vent for its now long-ago burnt-out fire! We were actually in the very core of a volcano. We proceeded but a few more steps, when the rays from our lamp revealed a vast yawning chasm before us, the light reflecting on a gulf of blackness, and not being powerful enough to illumine the furthermost edge of the pit. We shuddered as we looked at the awful abyss, and pictured to ourselves our ghastly fate if we had by some fatality walked over its terrible edge. An immense block of stone, that Graham and Sandy rolled down the steep declivity which led to the actual chasm, pitched into the blackness, and we heard it thundering down into the dizzy depths, first striking on one side, and then on the other, as it rebounded in its awful leaps like a mere pebble, the sounds echoing and re-echoing through the hollow dome around us. Then the blows sounded fainter and fainter to our ears, and finally died completely away, as if the boulder had leaped into another vaulted cavern still lower down, or been ground to dust by the force of its fall, and we heard no more!
Here under the very crest of the mountain, amongst the very roots of this rugged volcano, we lay down to rest; but not one of us could sleep. The grandeur of the surroundings kept us awake, even though we had put out our lamp, and the only ray of light in the pitchy darkness was the opening above us to the sky. All night we lay here watching the scintillating stars, like fiery gems, until one by one they became wan and indistinct with the coming dawn, and gradually the space around us was illumined as with a twilight brightness. The sun had risen, and the outer world was bathed in warmth; yet only a sickly reflection of the day penetrated into our magnificently grand, if cold and dismal refuge!
Anon the sun in his course across the sky shone down the mouth of the crater, and the light became stronger. We seated ourselves in the circle of his rays, and here we ate our cheerless meal—the remainder of the flesh we had had from Kios, and a few biscuits. Fortunately, our water supply was ample; the precious liquid dropped incessantly from far up in the rugged heights of the hollow mountain's roof; it trickled along the ground, and accumulated in little pools among the pumice stones at our feet. As we ate our meal, and tried to warm our chilled bodies in the faint sunshine, a great mass of rock came hurtling down from the very summit, and leaped with an awful rushing sound into the chasm, and for long we heard its terrific progress into the uttermost depths of the volcano. We looked up in terror and sprang to our feet, expecting each moment to be our last, and that the mountain itself was going to collapse and bury us like moles beneath its tottering ruins!
But even a worse fate than that threatened us, for boldly outlined against the sky, with helmets glinting in the sun, peering down into the gloomy depths were several of the troops from Edos, in the very act of hurling another piece of rock upon us. We started back in horror, and hurried out of the focus of that death-dealing aperture, burying ourselves from sight in the surrounding gloom.
"So our hiding-place is discovered, and we may expect no mercy from the bloodhounds," said Graham.
"We will fight for liberty this time," rejoined the Doctor, in a cool and resolute voice. "Fight, and die fighting," he continued, "rather than fall into the power of those merciless, cold-blooded people of Edos again."
Temple and Sandy were equally determined to fight to the last, and we began to prepare ourselves for the coming fray. We again turned on our electric lamp, and retreated into the darkest depths of the cavern in search of some spot where we might advantageously fight our foes. We discovered a small mound of broken rocks on the floor of the mountain, and on the summit of this we built up a rough rampart, behind which we might find some shelter when firing. Then, by the light of the lamp, we carefully examined our rifles and revolvers, and made ready our ammunition. We agreed that Graham and Sandy should fire, they being the best shots, and that the Doctor and Temple should load and hand the weapons. If we came to close quarters, each was to use his own revolver as best he could.
Before we had finished all our preparations, the great mountain vault began to echo with the steps of advancing troops. Clearly they knew of this wondrous cavern, and must have been aware of other and easier ways of entrance than the one we had chanced to discover. They were searching every nook and corner of the mountain as they came, and we could now form some idea of the vastness of the cavern by the length of the advancing line of troops. What astonished us most was their method of illuminating their path through the darkness. As seen from the distance of a mile, the movements of the coming troops were marked by a line of little fire-balls, irregularly dancing and bobbing to and fro; and as the soldiers came nearer we saw that each one had what appeared to be an incandescent lamp attached to his left ankle, which lit up the ground before him for a few yards! We held our breath in our great excitement, and curiously watched the foe. Then Sandy and Graham each took their trusty rifles and knelt behind the rough rampart, ready to fire the moment a good opportunity occurred. It was no use waiting until the troops advanced, because discovery was certain; their line of coming searchers were bound to cross the hill on which we were entrenched!
Our hiding-place was still undiscovered, and the troops were not more than two hundred yards away. We watched the line of lights break into two and circle round the yawning gulf; we saw a few troopers advance into the subdued light below the crater's mouth, and then disappear again into the darkness. Then Graham covered one of the dusky forms, and after taking careful aim, pulled the trigger and missed! The line was unbroken. A second afterwards, Sandy's piece went off with no better luck, the light being too uncertain for accurate aim. The awful echoes that our exploding rifles raised are beyond the powers of language to describe them. The vast vault seemed to be cracking in twain, and the reverberations appeared never going to subside. For a moment the troops were filled with panic; but we heard voices as of commanders cheering and encouraging their faltering men, and a moment after we were literally blinded by a vivid flood of brilliant light which gleamed out from behind us. Dazzled and blinded though we were, we saw at once that we were surrounded by enemies, another detachment having surprised us from the rear. We were now as exposed to view as if we had been in the open air, under the blazing sun of noonday, and before one of us could recover from his astonishment and fire a shot in defence, our position was stormed, our rifles and revolvers wrenched from our hands, and we were helpless as babes in the power of our enemies.