It did come into my head for a minute that we might have opened up some grave, or at least a place where human folk had been overtaken and buried by lava from the mountain; but I soon gave this up, for the earth was soft, and not a whit like lava, and as for a grave, no one would have dug it so deep down in the earth. I was just as much vexed as Billy was at this untoward event, but I think I was even more curious to learn what was beneath our unlucky well, and I went back soon into the hut, intending to examine the place. However, the evil smell was so overpowering that I was fain to seek the open air again, and it was some time, an hour or two, maybe, before the air became clear enough for us to enter the hut with any comfort. Bethinking myself that the clearing of the air showed that there might be nothing very terrible below, the foul smell being due to the sudden release of air long imprisoned, I got a length of our rope, and let it down with a stone on the end until it touched the bottom, which we found to be twice as deep as before; and when I did this, I perceived another thing which seemed to me mighty strange, which was nothing less than a current of air passing up through the well. There was, it is true, a passage now between the lake-side and the hut, but we had felt no current when the connection was first established, and yet we could not conceive of a current coming from the very bowels of the earth. Billy declared, in something of a fright, that we had got down to the roots of the mountain, whence came the steam and the hot water; but I answered that this was plainly absurd, the current of air that we felt being perfectly cool, though not very fresh.