As he descended thus slowly, the ladder seemed interminable and the pit bottomless, yet he realized when at last he reached the bottom that he could not have descended more than fifty feet.
The bottom of the ladder rested on a narrow ledge paved with what felt like large round stones, but what he knew from experience to be human skulls. He could not but marvel as to where so many countless thousands of the things had come from, until he paused to consider that the infancy of Caspak dated doubtlessly back into remote ages, far beyond what the outer world considered the beginning of earthly time. For all these eons the Wieroos might have been collecting human skulls from their enemies and their own dead--enough to have built an entire city of them.
Feeling his way along the narrow ledge, Bradley came presently to a blank wall that stretched out over the water swirling beneath him, as far as he could reach. Stooping, he groped about with one hand, reaching down toward the surface of the water, and discovered that the bottom of the wall arched above the stream.
How much space there was between the water and the arch he could not tell, nor how deep the former. There was only one way in which he might learn these things, and that was to lower himself into the stream. For only an instant he hesitated weighing his chances. Behind him lay almost certainly the horrid fate of An-Tak; before him nothing worse than a comparatively painless death by drowning. Holding his haversack above his head with one hand he lowered his feet slowly over the edge of the narrow platform.
Almost immediately he felt the swirling of cold water about his ankles, and then with a silent prayer he let himself drop gently into the stream.
Great was Bradley's relief when he found the water no more than waist deep and beneath his feet a firm, gravel bottom.
Feeling his way cautiously he moved downward with the current, which was not so strong as he had imagined from the noise of the running water.
Beneath the first arch he made his way, following the winding curvatures of the right-hand wall. After a few yards of progress his hand came suddenly in contact with a slimy thing clinging to the wall--a thing that hissed and scuttled out of reach. What it was, the man could not know; but almost instantly there was a splash in the water just ahead of him and then another.
On he went, passing beneath other arches at varying distances, and always in utter darkness. Unseen denizens of this great sewer, disturbed by the intruder, splashed into the water ahead of him and wriggled away. Time and again his hand touched them and never for an instant could he be sure that at the next step some gruesome thing might not attack him. He had strapped his haversack about his neck, well above the surface of the water, and in his left hand he carried his knife. Other precautions there were none to take.
The monotony of the blind trail was increased by the fact that from the moment he had started from the foot of the ladder he had counted his every step. He had promised to return for An-Tak if it proved humanly possible to do so, and he knew that in the blackness of the tunnel he could locate the foot of the ladder in no other way.
He had taken two hundred and sixty-nine steps--afterward he knew that he should never forget that number--when something bumped gently against him from behind. Instantly he wheeled about and with knife ready to defend himself stretched forth his right hand to push away the object that now had lodged against his body.
His fingers feeling through the darkness came in contact with something cold and clammy--they passed to and fro over the thing until Bradley knew that it was the face of a dead man floating upon the surface of the stream. With an oath he pushed his gruesome companion out into mid-stream to float on down toward the great pool and the awaiting scavengers of the deep.
At his four hundred and thirteenth step another corpse bumped against him--how many had passed him without touching he could not guess; but suddenly he experienced the sensation of being surrounded by dead faces floating along with him, all set in hideous grimaces, their dead eyes glaring at this profaning alien who dared intrude upon the waters of this river of the dead--a horrid escort, pregnant with dire forebodings and with menace.
Though he advanced very slowly, he tried always to take steps of about the same length; so that he knew that though considerable time had elapsed, yet he had really advanced no more than four hundred yards when ahead he saw a lessening of the pitch-darkness, and at the next turn of the stream his surroundings became vaguelydiscernible. Above him was an arched roof and on either hand walls pierced at intervals by apertures covered with wooden doors. Just ahead of him in the roof of the aqueduct was a round, black hole about thirty inches in diameter.
His eyes still rested upon the opening when there shot downward from it to the water below the naked body of a human being which almost immediately rose to the surface again and floated off down the stream. In the dim light Bradley saw that it was a dead Wieroo from which the wings and head had been removed. A moment later another headless body floated past, recalling what An-Tak had told him of the skull-collecting customs of the Wieroo.
Bradley wondered how it happened that the first corpse he had encountered in the stream had not been similarly mutilated.
The farther he advanced now, the lighter it became. The number of corpses was much smaller than he had imagined, only two more passing him before, at six hundred steps, or about five hundred yards, from the point he had taken to the stream, he came to the end of the tunnel and looked out upon sunlit water, running between grassy banks.
One of the last corpses to pass him was still clothed in the white robe of a Wieroo, blood-stained over the headless neck that it concealed.