Suddenly my ear, which leaned accidentally against the wall, appeared to catch, as it were, the faintest echo of a sound. I thought that I heard vague, incoherent, and distant voices. I quivered all over with excitement and hope!
“It must be hallucination,” I cried. “It cannot be! It is not true!”
But no! By listening more attentively, I really did convince myself that what I heard was truly the sound of human voices. To make any meaning out of the sound, however, was beyond my power. I was too weak even to hear distinctly. Still it was a positive fact that someone was speaking. Of that I was quite certain.
There was a moment of fear. A dread fell upon my soul that it might be my own words brought back to me by a distant echo. Perhaps without knowing it, I might have been crying aloud. I resolutely closed my lips, and once more placed my ear to the huge granite wall.
Yes, for certain. It was in truth the sound of human voices.
I now by the exercise of great determination dragged myself along the sides of the cavern, until I reached a point where I could hear more distinctly. But though I could detect the sound, I could only make out uncertain, strange, and incomprehensible words. They reached my ear as if they had been spoken in a low tone—murmured, as it were, afar off.
At last, I made out the word förlorad repeated several times in a tone betokening great mental anguish and sorrow.
What could this word mean, and who was speaking it? It must be either my uncle or the guide Hans! If, therefore, I could hear them, they must surely be able to hear me.
“Help,” I cried at the top of my voice; “help, I am dying!”
I then listened with scarcely a breath: I panted for the slightest sound in the darkness—a cry, a sigh, a question! But silence reigned supreme. No answer came! In this way some minutes passed. A whole flood of ideas flashed through my mind. I began to fear that my voice, weakened by sickness and suffering, could not reach my companions who were in search of me.
“It must be them,” I cried; “what other men can by possibility be buried a hundred miles below the level of the earth?” The mere supposition was preposterous.
I began, therefore, to listen again with the most breathless attention. As I moved my ears along the side of the place I was in, I found a mathematical point as it were, where the voices appeared to attain their maximum of intensity. The word förlorad again distinctly reached my ear. Then came again that rolling noise like thunder which had awakened me out of torpor.
“I begin to understand,” I said to myself after some little time devoted to reflection; “it is not through the solid mass that the sound reaches my ears. The walls of my cavernous retreat are of solid granite, and the most fearful explosion would not make uproar enough to penetrate them. The sound must come along the gallery itself. The place I was in must possess some peculiar acoustic properties of its own.”
Again I listened; and this time—yes, this time—I heard my name distinctly pronounced: cast as it were into space.
It was my uncle, the Professor, who was speaking. He was in conversation with the guide, and the word which had so often reached my ears, förlorad, was a Danish expression.
Then I understood it all. In order to make myself heard, I too must speak as it were along the side of the gallery which would carry the sound of my voice just as the wire carries the electric fluid from point to point.
But there was no time to lose. If my companions were only to remove a few feet from where they stood, the acoustic effect would be over, my Whispering Gallery would be destroyed. I again therefore crawled toward the wall, and said as clearly and distinctly as I could:
“Uncle Hardwigg.”
I then awaited a reply.
Sound does not possess the property of traveling with such extreme rapidity. Besides, the density of the air at that depth from light and motion was very far from adding to the rapidity of circulation. Several seconds elapsed, which to my excited imagination, appeared ages; and these words reached my eager ears, and moved my wildly beating heart: