Isaac Asimov
The Dim Rumble
I try hard not to believe what my friend George tells me. How can I possibly believe a man who tells me he has access to a two-centimeter-tall demon he calls Azazel, a demon who is really an extraterrestrial personage of extraordinary-but strictly limited-powers?
And yet George does have this ability to gaze at me unblinkingly out of his blue eyes and make me believe him temporarily-while he's talking. It's the Ancient Mariner effect, I suppose.
I once told him that I thought his little demon had given him the gift of verbal hypnosis, but George sighed and said, "Not at all! If he has given me anything, it is a curse for attracting confidences- except that that has been my bane since long before I ever encountered Azazel. The most extraordinary people insist on burdening me with their tales of woe. And sometimes-"
He shook his head in deep dejection. "Sometimes," he said, "the load I must bear as a result is more than human flesh and blood should be called upon to endure. Once, for instance, I met a man named Hannibal West…
I noticed him first [said George] in the lounge of a hotel at which I was staying. I noticed him chiefly because he encumbered my view of a statuesque waitress who was most becomingly and insufficiently dressed. I presume he thought I was looking at him, something I would certainly not willingly have done, and he took it as an overture of friendship.
He came to my table, bringing his drink with him, and seated himself without a by-your-leave. I am, by nature, a courteous man, and so I greeted him with a friendly grunt and glare, which he accepted in a calm way. He had sandy hair, plastered down across his scalp; pale eyes and an equally pale face; and the concentrated gaze of a fanatic, though I admit I didn't notice that until later on.
"My name," he said, "is Hannibal West, and I am a professor of geology. My particular field of interest is speleology. You wouldn't, by any chance, be a speleologist yourself?"
I knew at once he was under the impression he had recognized a kindred soul. My gorge rose at the possibility, but I remained courteous. "I am interested in all strange words," I said. "What is speleology?"
"Caves," he said. "The study and exploration of caves. That is my hobby, sir. I have explored caves on every continent except Antarctica. I know more about caves than anyone in the world."
"Very pleasant," I said, "and impressive." Feeling that I had in this way concluded a most unsatisfactory encounter, I signalled for the waitress to renew my drink and watched, in scientific absorption, her undulating progress across the room.
Hannibal West did not recognize that our conversation had been concluded, however. "Yes," he said, nodding vigorously, "you do well to say it is impressive. I have explored caves that are unknown to the world. I have entered underground grottoes that have never felt the footsteps of a human being. I am one of the few people alive today who has gone where no man, or woman, for that matter, has ever gone before. I have breathed air undisturbed, till then, by the lungs of a human being, and have seen sights and heard sounds no one else has ever seen or heard-and lived." He shuddered.
My drink had arrived, and I took it gratefully, admiring the grace with which the waitress bent low to place it on the table before me. I said, my mind not really on what I was saying, "You are a fortunate man."
"That I am not," said West. "I am a miserable sinner called upon by the Lord to avenge the sins of humanity."
Now at last I looked at him sharply, and noted the glare of fanaticism that nearly pinned me to the wall. "In caves?" I asked.
"In caves," he said, solemnly. "Believe me. As a professor of geology, I know what I am talking about."
I had met numerous professors in my lifetime who had known no such thing, but I forebore mentioning the fact.
Perhaps West read my opinion in my expressive eyes, for he fished a newspaper clipping out of a briefcase at his feet and passed it over to me. "Here!" he said, "Just look at that!"
I cannot say that it much rewarded close study. It was a three-paragraph item from some local newspaper. The headline read "A Dim Rumble" and the dateline was East Fishkill, New York. It was an account to the effect that local residents had complained to the police department of a dim rumble that left them uneasy and caused much disturbance among the cat and dog population of the town. The police had dismissed it as the sound of a distant thunderstorm, though the weather department heatedly denied that there had been any that day anywhere in the region.
"What do you think of that?" asked West.
"Might it have been a mass epidemic of indigestion?"
He sneered as though the suggestion were beneath contempt, though no one who has ever experienced indigestion would consider it that. Beneath the diaphragm, perhaps.
He said, "I have similar news items from papers in Liverpool, England; Bogota, Colombia; Milan, Italy; Rangoon, Burma; and perhaps half a hundred other places the world over. I collected them. All speak of a pervasive dim rumble that created fear and uneasiness and drove animals frantic, and all were reported within a two-day period."
"A single world-wide event," I said.
"Exactly! Indigestion, indeed." He frowned at me, sipped at his drink, then tapped his chest. "The Lord has placed a weapon in my hand, and I must learn to use it."
"What weapon is this?" I asked.
He didn't answer directly. "I found the cave quite by accident," he said, "something I welcome, for any cave whose opening advertises itself too openly is common property and has been host to thousands. Show me an opening narrow and hidden, one that is overgrown with vegetation, obscured by fallen rocks, veiled by a waterfall, precariously placed in an all but inaccessible spot, and I will show you a virgin cave worthy of inspection. You say you know nothing of speleology?"
"I have been in caves, of course," I said. "The Luray caverns in Virginia-"
"Commercial!" said West, screwing up his face and looking about for a convenient spot on the floor upon which to spit. Fortunately, he didn't find one.
"Since you know nothing about the divine joys of spelunking," he went on, swallowing instead, "I will not bore you with any account of where I found it, and how I explored it. It is, of course, not always safe to explore new caves without companions, but I perform solo explorations readily. After all, there is no one who can match me in this sort of expertise, to say nothing of the fact that I am as bold as a lion.
"In this case, it was indeed fortunate I was alone, for it would not have done for any other human being to discover what I discovered. I had been exploring for several hours when I entered a large and silent room with stalactites above and stalagmites below in gorgeous profusion. I skirted about the stalagmites, trailing my unwinding twine behind me, since I am not fond of losing my way, and then I came across what must have been a thick stalagmite that had broken off at some natural plane of cleavage. There was a litter of limestone to one side of it. What had caused the break I cannot say-perhaps some large animal, fleeing into the cave under pursuit, had blundered into the stalagmite in the dark; or else a mild earthquake had found this one stalagmite weaker than the others.
"In any case, the stump of the stalagmite was now topped by a smooth flatness just moist enough to glisten in my electric light. It was roughly round and strongly resembled a drum. So strongly did it resemble one that I automatically reached out and tapped it with my right forefinger."
He gulped down the rest of his drink and said, "It was a drum; or at least it was a structure that set up a vibration when tapped. As soon as I touched it, a dim rumble filled the room, a vague sound just at the threshold of hearing and all but subsonic. Indeed, as I was able to determine later on, the portion of the sound that was high enough in pitch to be heard was a tiny fraction of the whole. Almost all the sound expressed itself in mighty vibrations far too long-wave to affect the ear, though it shook the body itself. That unheard reverberation gave me the most unpleasantly uneasy feeling you can imagine.