ENTRANCE TO THE CAVERN
One night, when I had got down a considerable depth into the rock, I took the pick to loosen out some stone which I had drilled. As I struck, the sound of the rock was hollower than I had before noticed. My heart leaped into my mouth, and I had to pause. Then I struck again harder, and the sound was more hollow still. Whether or no it was the place I was looking for, there was some cave in the rock below me. I would have gone on working straight-way had there been anyone with me; but being alone I had to be careful. I was now standing on, evidently, only a layer of rock, over an opening of whose depth I was in ignorance. Should this piece of stone break away, as was quite possible from my working on it, I might be precipitated into a living tomb. The very secrecy in which I had kept my work, might tend to insure my death. Therefore I made all preparation for such a casualty. Henceforth I worked with round my waist a short rope the other end of which was fastened to a heavy staple in the wall. Even if the rock should give way underneath me, a foot or two would limit my fall. This precaution taken, I worked more furiously than ever. With a large hammer I struck the rock at the bottom of the shaft, again and again, with all my might. Then I heard a dull sound of something rattling below me; the top of the cave was falling in. I redoubled my
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