At sight of this black gulf Charging Buffalo displayed considerable fear, and threw down his pack of supplies with signs of haste. He had provided Zamacona with a good stock of resinous torches and provisions, and had guided him honestly and well; but refused to share in the venture that lay ahead. Zamacona gave him the trinkets he had kept for such an occasion, and obtained his promise to return to the region in a month; afterward shewing the way southward to the Pecos Pueblo villages. A prominent rock on the plain above them was chosen as a meeting-place; the one arriving first to pitch camp until the other should arrive.
In the manuscript Zamacona expressed a wistful wonder as to the Indian’s length of waiting at the rendezvous — for he himself could never keep that tryst. At the last moment Charging Buffalo tried to dissuade him from his plunge into the darkness, but soon saw it was futile, and gestured a stoical farewell. Before lighting his first torch and entering the opening with his ponderous pack, the Spaniard watched the lean form of the Indian scrambling hastily and rather relievedly upward among the trees. It was the cutting of his last link with the world; though he did not know that he was never to see a human being — in the accepted sense of that term — again.
Zamacona felt no immediate premonition of evil upon entering that ominous doorway, though from the first he was surrounded by a bizarre and unwholesome atmosphere. The passage, slightly taller and wider than the aperture, was for many yards a level tunnel of Cyclopean masonry, with heavily worn flagstones under foot, and grotesquely carved granite and sandstone blocks in sides and ceiling. The carvings must have been loathsome and terrible indeed, to judge from Zamacona’s description; according to which most of them revolved around the monstrous beings Yig and Tulu. They were unlike anything the adventurer had ever seen before, though he added that the native architecture of Mexico came closest to them of all things in the outer world. After some distance the tunnel began to dip abruptly, and irregular natural rock appeared on all sides. The passage seemed only partly artificial, and decorations were limited to occasional cartouches with shocking bas-reliefs.
Following an enormous descent, whose steepness at times produced an acute danger of slipping and tobogganing, the passage became exceedingly uncertain in its direction and variable in its contour. At times it narrowed almost to a slit or grew so low that stooping and even crawling were necessary, while at other times it broadened out into sizeable caves or chains of caves. Very little human construction, it was plain, had gone into this part of the tunnel; though occasionally a sinister cartouche or hieroglyphic on the wall, or a blocked-up lateral passageway, would remind Zamacona that this was in truth the aeon-forgotten high-road to a primal and unbelievable world of living things.
For three days, as best he could reckon, Pánfilo de Zamacona scrambled down, up, along, and around, but always predominately downward, through this dark region of palaeogean night. Once in a while he heard some secret being of darkness patter or flap out of his way, and on just one occasion he half glimpsed a great, bleached thing that set him trembling. The quality of the air was mostly very tolerable; though foetid zones were now and then met with, while one great cavern of stalactites and stalagmites afforded a depressing dampness. This latter, when Charging Buffalo had come upon it, had quite seriously barred the way; since the limestone deposits of ages had built fresh pillars in the path of the primordial abyss-denizens. The Indian, however, had broken through these; so that Zamacona did not find his course impeded. It was an unconscious comfort to him to reflect that someone else from the outside world had been there before — and the Indian’s careful descriptions had removed the element of surprise and unexpectedness. More — Charging Buffalo’s knowledge of the tunnel had led him to provide so good a torch supply for the journey in and out, that there would be no danger of becoming stranded in darkness. Zamacona camped twice, building a fire whose smoke seemed well taken care of by the natural ventilation.
At what he considered the end of the third day — though his cocksure guesswork chronology is not at any time to be given the easy faith that he gave it — Zamacona encountered the prodigious descent and subsequent prodigious climb which Charging Buffalo had described as the tunnel’s last phase. As at certain earlier points, marks of artificial improvement were here discernible; and several times the steep gradient was eased by a flight of rough-hewn steps. The torch shewed more and more of the monstrous carvings on the walls, and finally the resinous flare seemed mixed with a fainter and more diffusive light as Zamacona climbed up and up after the last downward stairway. At length the ascent ceased, and a level passage of artificial masonry with dark, basaltic blocks led straight ahead. There was no need for a torch now, for all the air was glowing with a bluish, quasi-electric radiance that flickered like an aurora. It was the strange light of the inner world that the Indian had described — and in another moment Zamacona emerged from the tunnel upon a bleak, rocky hillside which climbed above him to a seething, impenetrable sky of bluish coruscations, and descended dizzily below him to an apparently illimitable plain shrouded in bluish mist.