Preceded by Sumichrast, I ventured down to the bottom of the pit. A narrow passage led from it into a vast chamber, the more distant parts of which we could not discern on account of the darkness. While my friend was exploring, I returned for Lucien. The lamp, thanks to the Indian's skill, was safely let down without extinguishing the light; lastly l'Encuerado himself made his appearance. Passing along the narrow passage, I soon perceived Sumichrast, who looked like some fantastic apparition as he shook his torch over his head, endeavoring to see through the darkness which enveloped us. The lamp being set down at the entrance of the passage, each of us took a lighted torch, and advanced at a slow pace. Sumichrast and the Indian skirted the wall to the left, while I walked along the wall to the right. Our smoky torches gave but an imperfect light, and we could scarcely see beyond three yards in front of us. A little farther on, the ground was strewn with fallen stones; before venturing on this dangerous ground, I cast a glance towards my companions; they were not in sight. I gave them a call--a formidable clamor resounded through the chamber, and Lucien crept close to me. "It is the echo returning to our ears Sumichrast's answer," I hastened to tell him. "They are in another chamber; you call them now!" The boy, agitated, raised his voice. Immediately the dark vaults seemed to repeat his words; and the sound increased, as it moved away, as if a thousand persons, placed at intervals, were repeating some watch-word. A sonorous "Hiou! hiou!" prevailed over the uproar, and the face of l'Encuerado appeared on our right before the echo of the call had died away. "Come and see a beautiful church!" cried the Indian. "A church made of diamonds, Chanito!" We moved towards the entrance by an inclined passage, down the slope of which we followed l'Encuerado. The distance between the walls gradually increased, and soon we found ourselves in a vast hall studded with stalactites; in it Sumichrast arranged the lighted torches. [Illustration: "The wildest dreams could not picture a stranger . . . style of architecture."]