The Cavern
Having got down to the pipe, which, as I have said, was but a few inches above the cavity into which we had broken, we saw that we must be even more careful, for if the earth should give way all of a sudden, as it did before, we might for all we knew be hurled into a bottomless abyss. All the time we had been digging we had felt the current of cool air striking upward against us, from which it was plain that the chamber below was not a perfectly closed vault, and the only comfort we had of this was that we were certainly not coming to the old smoker's kitchen, as Billy called it, for then the air would have been hot. To avoid this headlong fall, I considered we should now cease to stand on the ledge of earth at the side of the hole, and rig up a rope ladder which we might attach securely to the doorposts above. Billy was digging when this idea came into my head, he being lighter than I, and after I told him of it he scrambled up very quickly by means of steps we had cut in the side, confessing he was glad to get out in safety.
It took us some time to make a rope ladder, but when it was done, and fastened to the doorposts, I descended and hacked away with my spade at the sides of the hole below me until I had made it big enough for my body to go through. Then I got Billy to hand down to me a lighted torch, and bending as low as I could, I clung to the ladder with one hand, and with the other held the torch in the space below, being nearly suffocated by its stinking fumes. However, by moving the torch backwards and forwards I made out that the space was a small chamber, oblong in shape, but not regular, and with a floor, but, so far as I could see, no outlet, though I knew there must be one, because of the current of air. Feeling by no means sure of the depth of the floor below me, I clambered up again and pulled the ladder after me, and we lengthened it by some three feet before I descended again. By the light of my torch I then saw that I could drop to the floor without any danger, and I let go the ladder, and fell upon my feet on hard rock.
"What cheer, master?" calls out Billy, with his face close to the top of the shaft above. I told him that I was safe and what manner of place I was in, and said I would explore further, and when I did so I found that we had no need to trouble ourselves about the safety of our hut, because the walls of this underground chamber were of hard rock, like the rocks on the sides of the mountain, and the roof the same, except at the place where we had dug our shaft. How this came to be I did not trouble to think,[[1]] nor did it concern us, the great matter for us being that our hut had a solid foundation, which was a great comfort. When I told this to Billy, by shouting up through the shaft, the sound of my voice echoing very strangely, he cried back that he was glad to hear it and that he was coming down to see. "No, no," I cried at this; "you keep guard above while I seek further; and besides, the ladder does not reach the ground, and perhaps you couldn't get up again."
"Then how will you get up, master?" says Billy.
"Why, you can draw the ladder up while I go exploring, and by the time I come back you can lengthen it," was my answer.
This he agreed to do, only he begged me not to be long.
A Tunnel
When I came to examine the chamber, I found it to be neither so large nor so lofty as I had first supposed. The general height of it was not above five feet, though in parts it rose to ten feet or more. I had soon made a tour about the chamber, the compass of which was perhaps sixty or seventy feet, and in one corner of it I at last discovered an opening, through which, I did not doubt, came the current of air I have before mentioned. It was, as I found when I held my torch to it, a very low and narrow passage, not above four feet high, and the draught of air was so strong that it made my torch flare, and, indeed, was like to blow it out. This made me consider whether I had not better rest content and go no further; but curiosity was strong within me, and so I went into the passage, or tunnel, having to bend my body very low, and crept along with great caution, holding the torch in front of me lest I came unawares upon a chasm and broke my neck. The passage seemed to me to incline slightly downward, though I could not be sure of this, since there were not only several crooks and turns in it, so that not many yards of it were straight, but also it was in some parts pretty near choked with rocks and stones, which I supposed had fallen from the roof and sides. However, I picked my way among these obstacles when they occurred, and found as I went on that the passage became both wider and loftier, so that I was able to stand upright.
After I had gone some distance through this tunnel, wondering whether it was natural or had been made by men's hands, and inclining to the former belief, I perceived that it was joined by another passage which ran into it from my right hand, and the two passages thus joined in one became a tunnel which increased both in width and height the further I went. Whereas at starting from the cavern I had had to bend low, with little space on either side of me, I now found myself in a passage which in some parts was as much as twenty feet high, as near as I could guess in the deceitful light of my torch, and so wide that five or six men could easily have walked abreast in it. And as I still kept my eyes cast down, being heedful of my footing, I perceived by and by on the floor of the passage sundry small whitish objects which, when I stooped to examine them, I found to be shells, and they became more numerous the further I went. I began now to question with myself whether this tunnel did not communicate with the sea, and whether the sea ever came up through it so far into the interior of the island, for the cavern whence I had started on this journey was directly below our hut, and that was situate at least half a mile from the sea-shore.