I have said that our study of the decadent sculptures brought about a change in our immediate objective. This, of course, had to do with the chiseled avenues to the black inner world, of whose existence we had not known before, but which we were now eager to find and traverse. From the evident scale of the carvings we deduced that a steeply descending walk of about a mile through either of the neighboring tunnels would bring us to the brink of the dizzy, sunless cliffs about the great abyss; down whose sides paths, improved by the Old Ones, led to the rocky shore of the hidden and nighted ocean. To behold this fabulous gulf in stark reality was a lure which seemed impossible of resistance once we knew of the thing — yet we realized we must begin the quest at once if we expected to include it in our present trip.
It was now 8 P.M., and we did not have enough battery replacements to let our torches burn on forever. We had done so much studying and copying below the glacial level that our battery supply had had at least five hours of nearly continuous use, and despite the special dry cell formula, would obviously be good for only about four more — though by keeping one torch unused, except for especially interesting or difficult places, we might manage to eke out a safe margin beyond that. It would not do to be without a light in these Cyclopean catacombs, hence in order to make the abyss trip we must give up all further mural deciphering. Of course we intended to revisit the place for days and perhaps weeks of intensive study and photography — curiosity having long ago got the better of horror — but just now we must hasten.
Our supply of trail-blazing paper was far from unlimited, and we were reluctant to sacrifice spare notebooks or sketching paper to augment it, but we did let one large notebook go. If worse came to worst we could resort to rock chipping — and of course it would be possible, even in case of really lost direction, to work up to full daylight by one channel or another if granted sufficient time for plentiful trial and error. So at last we set off eagerly in the indicated direction of the nearest tunnel.
According to the carvings from which we had made our map, the desired tunnel mouth could not be much more than a quarter of a mile from where we stood; the intervening space showing solid-looking buildings quite likely to be penetrable still at a sub-glacial level. The opening itself would be in the basement — on the angle nearest the foothills — of a vast five-pointed structure of evidently public and perhaps ceremonial nature, which we tried to identify from our aerial survey of the ruins.
No such structure came to our minds as we recalled our flight, hence we concluded that its upper parts had been greatly damaged, or that it had been totally shattered in an ice rift we had noticed. In the latter case the tunnel would probably turn out to be choked, so that we would have to try the next nearest one — the one less than a mile to the north. The intervening river course prevented our trying any of the more southern tunnels on this trip; and indeed, if both of the neighboring ones were choked it was doubtful whether our batteries would warrant an attempt on the next northerly one — about a mile beyond our second choice.
As we threaded our dim way through the labyrinth with the aid of map and compass — traversing rooms and corridors in every stage of ruin or preservation, clambering up ramps, crossing upper floors and bridges and clambering down again, encountering choked doorways and piles of debris, hastening now and then along finely preserved and uncannily immaculate stretches, taking false leads and retracing our way (in such cases removing the blind paper trail we had left), and once in a while striking the bottom of an open shaft through which daylight poured or trickled down — we were repeatedly tantalized by the sculptured walls along our route. Many must have told tales of immense historical importance, and only the prospect of later visits reconciled us to the need of passing them by. As it was, we slowed down once in a while and turned on our second torch. If we had had more films, we would certainly have paused briefly to photograph certain bas-reliefs, but time-consuming hand-copying was clearly out of the question.
I come now once more to a place where the temptation to hesitate, or to hint rather than state, is very strong. It is necessary, however, to reveal the rest in order to justify my course in discouraging further exploration. We had wormed our way very close to the computed site of the tunnel’s mouth — having crossed a second-story bridge to what seemed plainly the tip of a pointed wall, and descended to a ruinous corridor especially rich in decadently elaborate and apparently ritualistic sculptures of late workmanship — when, shortly before 8:30 P.M., Danforth’s keen young nostrils gave us the first hint of something unusual. If we had had a dog with us, I suppose we would have been warned before. At first we could not precisely say what was wrong with the formerly crystal-pure air, but after a few seconds our memories reacted only too definitely. Let me try to state the thing without flinching. There was an odor — and that odor was vaguely, subtly, and unmistakably akin to what had nauseated us upon opening the insane grave of the horror poor Lake had dissected.
Of course the revelation was not as clearly cut at the time as it sounds now. There were several conceivable explanations, and we did a good deal of indecisive whispering. Most important of all, we did not retreat without further investigation; for having come this far, we were loath to be balked by anything short of certain disaster. Anyway, what we must have suspected was altogether too wild to believe. Such things did not happen in any normal world. It was probably sheer irrational instinct which made us dim our single torch — tempted no longer by the decadent and sinister sculptures that leered menacingly from the oppressive walls — and which softened our progress to a cautious tiptoeing and crawling over the increasingly littered floor and heaps of debris.
Danforth’s eyes as well as nose proved better than mine, for it was likewise he who first noticed the queer aspect of the debris after we had passed many half-choked arches leading to chambers and corridors on the ground level. It did not look quite as it ought after countless thousands of years of desertion, and when we cautiously turned on more light we saw that a kind of swath seemed to have been lately tracked through it. The irregular nature of the litter precluded any definite marks, but in the smoother places there were suggestions of the dragging of heavy objects. Once we thought there was a hint of parallel tracks as if of runners. This was what made us pause again.
It was during that pause that we caught — simultaneously this time — the other odor ahead. Paradoxically, it was both a less frightful and more frightful odor — less frightful intrinsically, but infinitely appalling in this place under the known circumstances — unless, of course, Gedney — for the odor was the plain and familiar one of common petrol — every-day gasoline.
Our motivation after that is something I will leave to psychologists. We knew now that some terrible extension of the camp horrors must have crawled into this nighted burial place of the aeons, hence could not doubt any longer the existence of nameless conditions — present or at least recent just ahead. Yet in the end we did let sheer burning curiosity — or anxiety — or autohypnotism — or vague thoughts of responsibility toward Gedney — or what not — drive us on. Danforth whispered again of the print he thought he had seen at the alley turning in the ruins above; and of the faint musical piping — potentially of tremendous significance in the light of Lake’s dissection report, despite its close resemblance to the cave-mouth echoes of the windy peaks — which he thought he had shortly afterward half heard from unknown depths below. I, in my turn, whispered of how the camp was left — of what had disappeared, and of how the madness of a lone survivor might have conceived the inconceivable — a wild trip across the monstrous mountains and a descent into the unknown, primal masonry.
But we could not convince each other, or even ourselves, of anything definite. We had turned off all light as we stood still, and vaguely noticed that a trace of deeply filtered upper day kept the blackness from being absolute. Having automatically begun to move ahead, we guided ourselves by occasional flashes from our torch. The disturbed debris formed an impression we could not shake off, and the smell of gasoline grew stronger. More and more ruin met our eyes and hampered our feet, until very soon we saw that the forward way was about to cease. We had been all too correct in our pessimistic guess about that rift glimpsed from the air. Our tunnel quest was a blind one, and we were not even going to be able to reach the basement out of which the abyssward aperture opened.
The torch, flashing over the grotesquely carved walls of the blocked corridor in which we stood, showed several doorways in various states of obstruction; and from one of them the gasoline odor — quite submerging that other hint of odor — came with especial distinctness. As we looked more steadily, we saw that beyond a doubt there had been a slight and recent clearing away of debris from that particular opening. Whatever the lurking horror might be, we believed the direct avenue toward it was now plainly manifest. I do not think anyone will wonder that we waited an appreciable time before making any further motion.
And yet, when we did venture inside that black arch, our first impression was one of anticlimax. For amidst the littered expanse of that sculptured crypt — a perfect cube with sides of about twenty feet — there remained no recent object of instantly discernible size; so that we looked instinctively, though in vain, for a farther doorway. In another moment, however, Danforth’s sharp vision had descried a place where the floor debris had been disturbed; and we turned on both torches full strength. Though what we saw in that light was actually simple and trifling, I am none the less reluctant to tell of it because of what it implied. It was a rough leveling of the debris, upon which several small objects lay carelessly scattered, and at one corner of which a considerable amount of gasoline must have been spilled lately enough to leave a strong odor even at this extreme superplateau altitude. In other words, it could not be other than a sort of camp — a camp made by questing beings who, like us, had been turned back by the unexpectedly choked way to the abyss.
Let me be plain. The scattered objects were, so far as substance was concerned, all............