I sought about the bottom with my hands for a few moments till I found the outline of a squared stone that had been let into the rock. In the centre of this I found a hole, out of which I picked the dirt with my dagger. Then, putting the end of my iron bar into it, I pulled, and the stone turned over on a hinge, leaving an opening half its size. Down this I thrust my arm, and found a chain of copper which hung down into a deep well below. I pulled this with all my strength until something gave way at the bottom, then I drew the chain up, and cast my iron bar under it across the hole. As I did this, I heard the deep, smothered roar of waters rushing away far below me into the bowels of the earth. Then I got out of the hole and went back to the cleft. I lit a candle and looked down at the pool. It was no longer stagnant now, but seething and eddying like a whirlpool. I beckoned to Tupac, who was standing a little way behind me, and as he came and looked over my shoulder I pointed down into the dark gulf, out of which the bottom was rapidly falling, and said,-- 'See, the waters are opening the way by which the Son of the Sun shall go into his kingdom. Watch now, and listen!' 'Son of the Sun and Lord of the Four Regions, it is true!' he whispered as the waters eddied round faster and faster, and gurgled and rattled down into some unknown abyss. Soon they vanished altogether, leaving only a dark, black, and seemingly fathomless cavern in the place where they had been. I waited until the sound of the last gurgle had died away in the depths, and then I turned to Tupac and said,-- 'The way is open. Tell Ullullo to bring the lantern and light it. There must be no other light. You and the rest follow me, and let two strong men bring the stranger.' He did as I bade him, and when I had lit the lantern I cast its rays about the gulf beneath me till I found the continuation of the broken stairway above, and then picking my way carefully down the dank, slimy steps, I led the way into the heart of the rock, the rest following, guided by the spreading ray of light in front of me.' I counted fifty steps, and then stopped and turned sharply to the right. The fiftieth step ended against a wall of rock, still dripping with the water that was running down from the arched roof of the chamber. I measured ten spans with my hand from the wall where the steps ended, and made a mark with my dagger on the rock. Then from the floor I measured eight spans in a line across the mark. Where the eighth span ended I made another mark, and with the help of my lantern I found a silver socket let into the rock. It was a plate with a hole in the centre large enough to admit the iron bar which I had brought for the purpose. I put it in, and whispering to Tupac to help me, we gripped the bar, and after two or three hard pulls felt it coming towards us.