I came to a downward incline and followed it to profounder depths. Floors flashed by me as I raced, but I did not pause to explore them. In my whirling brain there had begun to beat a certain rhythm which set my right hand twitching in unison. I wanted to unlock something, and felt that I knew all the intricate twists and pressures needed to do it. It would be like a modern safe with a combination lock. Dream or not, I had once known and still knew. How any dream—or scrap of unconsciously absorbed legend—could have taught me a detail so minute, so intricate, and so complex, I did not attempt to explain to myself. I was beyond all coherent thought. For was not this whole experience—this shocking familiarity with a set of unknown ruins, and this monstrously exact identity of everything before me with what only dreams and scraps of myth could have suggested—a horror beyond all reason? Probably it was my basic conviction then—as it is now during my saner moments—that I was not awake at all, and that the entire buried city was a fragment of febrile hallucination.
Eventually I reached the lowest level and struck off to the right of the incline. For some shadowy reason I tried to soften my steps, even though I lost speed thereby. There was a space I was afraid to cross on this last, deeply buried floor, and as I drew near it I recalled what thing in that space I feared. It was merely one of the metal-barred and closely guarded trap-doors. There would be no guards now, and on that account I trembled and tiptoed as I had done in passing through that black basalt vault where a similar trap-door had yawned. I felt a current of cool, damp air, as I had felt there, and wished that my course led in another direction. Why I had to take the particular course I was taking, I did not know.
When I came to the space I saw that the trap-door yawned widely open. Ahead the shelves began again, and I glimpsed on the floor before one of them a heap very thinly covered with dust, where a number of cases had recently fallen. At the same moment a fresh wave of panic clutched me, though for some time I could not discover why. Heaps of fallen cases were not uncommon, for all through the aeons this lightless labyrinth had been racked by the heavings of earth and had echoed at intervals to the deafening clatter of toppling objects. It was only when I was nearly across the space that I realised why I shook so violently.
Not the heap, but something about the dust of the level floor was troubling me. In the light of my torch it seemed as if that dust were not as even as it ought to be—there were places where it looked thinner, as if it had been disturbed not many months before. I could not be sure, for even the apparently thinner places were dusty enough; yet a certain suspicion of regularity in the fancied unevenness was highly disquieting. When I brought the torchlight close to one of the queer places I did not like what I saw—for the illusion of regularity became very great. It was as if there were regular lines of composite impressions—impressions that went in threes, each slightly over a foot square, and consisting of five nearly circular three-inch prints, one in advance of the other four.
These possible lines of foot-square impressions appeared to lead in two directions, as if something had gone somewhere and returned. They were of course very faint, and may have been illusions or accidents; but there was an element of dim, fumbling terror about the way I thought they ran. For at one end of them was the heap of cases which must have clattered down not long before, while at the other end was the ominous trap-door with the cool, damp wind, yawning unguarded down to abysses past imagination.
Chapter VIII
That my strange sense of compulsion was deep and overwhelming is shewn by its conquest of my fear. No rational motive could have drawn me on after that hideous suspicion of prints and the creeping dream-memories it excited. Yet my right hand, even as it shook with fright, still twitched rhythmically in its eagerness to turn a lock it hoped to find. Before I knew it I was past the heap of lately fallen cases and running on tiptoe through aisles of utterly unbroken dust toward a point which I seemed to know morbidly, horribly well. My mind was asking itself questions whose origin and relevancy I was only beginning to guess. Would the shelf be reachable by a human body? Could my human hand master all the aeon-remembered motions of the lock? Would the lock be undamaged and workable? And what would I do—what dare I do—with what (as I now commenced to realise) I both hoped and feared to find? Would it prove the awesome, brain-shattering truth of something past normal conception, or shew only that I was dreaming?