For a long time no one in the earth-borer spoke--didn't even try to--for though the thunder of the disintegrators was muted, inside, to a steady drone, conversation was almost impossible. The three were crowded quite close in the spherical inner control compartment. Sue sat on a little collapsible stool by the bowed, but by no means subdued, figure of Professor David Guinness, while Quade sat on the wire guard of the gyroscope, which was in the exact center of the floor.
The depth gauge showed two hundred feet. Already the three people were numb from the vibration; they hardly felt any sensation at all, save one of great weight pressing inwards. The compartment was fairly cool and the air good--kept so by the automatic air rectifiers and the insulation, which shut out the heat born of their passage.
Quade had been carefully watching Guinness's manipulation of the controls, when he was struck by a thought. At once he stood up, and shouted in the elderly inventor's ear: "Try the rockets! I want to be sure this thing will go back up!"
Without a word Guinness shoved back the lever controlling the disintegrators, at the same time whirling a small wheel full over. The thudding drone died away to a whisper, and was replaced by sharper thundering, as the stream of the propulsion rockets beneath the sphere was released. A delicate needle trembled on a gauge, danced at the figure two hundred, then crept back to one-ninety ... one-sixty ... one-forty.... Quade's eyes took in everything.
"Excellent, Guinness!" he yelled. "Now--down once more!"
The rockets were slowly cut; the borer jarred at the bottom of its hole; again the disintegrators droned out. The sphere dug rapidly into the warm ground, biting lower and lower. At ten miles an hour it blasted a path to depths hitherto unattainable to man, sweeping away rock and gravel and sand--everything that stood in its way. The depth gauge rose to two thousand, then steadily to three and four. So it went on for nearly half an hour.
At the end of that time, at a depth of nearly four miles, Quade got stiffly to his feet and once more shouted into the professor's ear.
"We ought to be close to that radium, now," he said. "I think--"
But his words stopped short. The floor of the sphere suddenly fell away from their feet, and they felt themselves tumbled into a wild plunge. The drone of the disintegrators, hitherto muffled by the earth they bit into, rose to a hollow scream. Before the professor quite knew what was happening, there was a stunning crash, a shriek of tortured metal--and the earth-borer rocked and lay still....
The whole world seemed to be filled with thunder when David Guinness came back to consciousness. He opened his eyes and stared up into a darkness to which it took him some time to accustom himself. When he did, he made out hazily that he was lying on the floor of a vast dark cavern. He could dimly see its jagged roof, perhaps fifty feet above. There was the strong smell of damp earth in his nostrils; his head was splitting from the steady drone in his ear-drums. Suddenly he remembered what had happened. He groaned slightly and tried to sit up.
But he could not. His arms and legs were tied. Someone had removed him from the earth-borer and bound him on the floor of the cavern they had plunged into.
David Guinness strained at the rope. It was futile, but in doing so he twisted his head around and saw another form, similarly tied, lying close to him. He gave a little cry of relief. It was Sue. And she was conscious, her eyes on his face.
She spoke to him, but he could not understand her for the drone in his ears, and when he spoke to her it was the same. But the professor did not just then continue his effort to converse with her. His attention was drawn to the borer, now dimly illuminated by its portable light, which had been secured to the door. It was right side up, and appeared to be undamaged. The broad ray of the searchlight fell far away on one of the cavern's rough walls. He could just make out James Quade standing there, his back towards them.
He was hacking at the wall with a pick. Presently he dropped the tool and wrenched at the rock with bare hands. A large chunk came loose. He hugged it to him and turned and strode back towards the two on the floor, and as he drew near they could plainly see a gleam of triumph in his eyes.
"You know what this is?" he shouted. Guinness could only faintly hear him. "Wealth! Millions! Of course we always knew the radium was here, but this is the proof. And now we've a way of getting it out--thanks to your borer! All the credit is yours, Professor Guinness! You shall have the credit, and I'll have the money."
Guinness tugged furiously at his bonds again. "You--you--" he gasped. "How dare you tie us this way! Release us at once! What do you mean by it?"
Quade smiled unpleasantly. "You're very stupid, Guinness. Haven't you guessed by now what I'm going to do?" He paused, as if waiting for an answer, and the smile on his face gave way to a look of savage menace. For the first time his bitter feelings came to the surface.
"Have you forgotten how close I came to going to jail over those charges of yours a year ago?" he said. "Have you forgotten the disgrace to me that followed?--the stigma that forced me to disappear for months? You fool, do you think I've forgotten?--or that I'd let you--"
"Quade," interrupted the older man, "you know very well you were guilty. I caught you red-handed. You didn't fool anyone--except the jury that let you go. So save your breath, and, if you've the sense you were born with, release my daughter and me. Why, you're crazy!" he cried with mounting anger. "You can't get away with this! I'll have you in jail within forty-eight hours, once I get back to the surface!"
With an effort Quade controlled his feelings and assumed his oily, sarcastic manner. "That's just it," he said: "'once you get back!' How stupid you are! You don't seem to realize that you're not going back to the surface. You and your daughter."
Sue gasped, and her father's eyes went wide. There was a tense silence.
"You wouldn't dare!" the inventor cried finally. "You wouldn't dare!"
"It's rather large, this cavern," Quade went on. "You'll have plenty of room. Perhaps I'll untie you before I go back up, so--"
"You can't get away with it!" shouted the old man, tremendously excited. "Why, you can't, possibly! Philip Holmes'll track you down--he'll tell the police--he'll rescue us! And then--"
Quade smiled suavely. "Oh, no, he won't. Perhaps you remember the shot that sounded from the water-hole? Well, when I and my assistant, Juan, heard Holmes say he was going for water, I told Juan to follow him to the water-hole and bind him, to keep him from interfering till I got back up. But Mr. Holmes is evidently of an impulsive disposition, and must have caused trouble. Juan, too, is impulsive; he is a Mexican. And he had a gun. I'm afraid he was forced to use it.... I am quite sure Philip Holmes will not, as you say, track me down."
David Guinness looked at his daughter's white face and horror-filled eyes and suddenly crumpled. Humbly, passionately, he begged Quade to take her back up. "Why, she's never done anything to you, Quade!" he pleaded. "You can't take her life like that! Please! Leave me, if you must, but not her! You can't--"
But suddenly the old man noticed that Quade was not listening. His head was tilted to one side as if he was straining to hear something else. Guinness was held silent for a moment by the puzzled look on the other's face and the strange way he was acting.
"Do you hear it?" Quade asked at last; and without waiting for an answer, he knelt down and put his ear to the ground. When he rose his face was savage, and he cursed under his breath.
"Why, it's a humming!" muttered Professor Guinness. "And it's getting louder!"
"It sounds like another borer!" ventured Sue.
The humming grew in volume. Then, from the ceiling, a rock dropped. They were looking at the cavern roof and saw it start, but they did not hear it strike, for the ever-growing humming echoed loudly through the cavern. They saw another rock fall; and another.
"For God's sake, what is it?" cried Guinness.
Quade looked at him and slowly drew out his automatic.
"Another earth-borer, I think," he answered. "And I rather expect it contains your young friend Mr. Holmes. Yes--coming to rescue you."
For a moment Guinness and his daughter were too astounded to do anything but gape. She finally exclaimed: "But--but then Phil's alive?"
James Quade smiled. "Probably--for the moment. But don't let your hopes rise too high. The borer he's in isn't strong enough to survive a fifty-foot plunge." He was shouting now, so loud was the thunder from above. "And," he added, "I'm afraid he's not strong enough to survive it, either!"
CHAPTER II.
The Man-Hunt When Phil Holmes started off to the water-hole, his head was full of the earth-borer and the imminent descent. Now that the long-awaited time had come, he was at fever-pitch to be off, and it did not take him long to cover the mile of sandy waste. His thoughts were far inside the earth as he dipped the jug into the clear cool water and sloshed it full.
So the rope that snaked softly through the air and dropped in a loop over his shoulders came as a stark surprise. Before he knew what was happening it had slithered down over his arms and drawn taut just above the elbows, and he was yanked powerfully backwards and almost fell.
But he managed to keep his feet as he staggered backward, and turning his head he saw the small dark figure of his aggressor some fifteen feet away, keeping tight the slack.
Phil's surprise turned to sudden fury and he completely lost his head. What he did was rash; mad; and yet, as it turned out, it was the only thing that could have saved him. Instinctively, without hesitating one second, and absolutely ignoring an excited command to stand still, he squirmed face-on to his aggressor, lowered his head and charged.
The distance was short. Halfway across it, a gun barked, and he heard the bullet crack into the water jug, which he was still holding in front of himself. And even before the splintered fragments reached the ground he had crashed into the firer.
He hit him with all the force of a tackling lineman, and they both went down. The man grunted as the wind was jarred out of him, but he wriggled like an eel and managed to worm aside and bring up his gun.
Then there was a desperate flurry of bodies in the coarse sand. Holmes dived frantically for the gun hand and caught it; but, handicapped as he was by the rope, he could not hold it. Slowly its muzzle bent upward to firing position.
Desperately, he wrenched the arm upwards, in the direction it had been straining to go, and the sudden unexpected jerk doubled the man's arm and brought the weapon across his chest. For a moment there was a test of strength as Phil lay chest to chest over his opponent, the gun blocked between. Then the other grunted; squirmed violently--and there was a muffled explosion.
A cry of pain cut the midnight air, and with insane strength Holmes' ambusher fought free from his grip, staggered to his feet and went reeling away. Phil tore loose from the rope and bounded after him, never feeling, at the moment, his powder-burned chest.
And then he halted in his tracks.
A great roar came thundering over the desert!
At once he knew that it came from the earth-borer's disintegrators. The sphere had started down without him.
He stood stock still, petrified with surprise, facing the sound, while his attacker melted farther and farther into the night. And then, suddenly, Phil Holmes was sprinting desperately back towards the Guinness camp.
He ran until he was exhausted; walked for a little while his legs gathered more strength, and his laboring lungs more air; and then ran again. As the minutes passed, the thunder lessened rapidly into a muffled drone; and by the time Phil had panted up to the brink of the hole that gaped where but a little time before the sphere was standing, it had become but a distant purr. He leaned far over and peered into the hot blackness below, but could see nothing.
Phil knelt there silently for some minutes, shocked by his strange attack, bewildered by the unexpected descent of the borer. For a time his mind would not work; he had no idea what to do. But gradually his thoughts came to order and made certain things clear.
He had been deliberately ambushed. Only by luck had he escaped, he told himself. If it hadn't been for the water jug, he'd now be out of the picture. And on the heels of the ambush had came the surprising descent of the earth-borer. The two incidents coincided too well: the same mind had planned them. And two, men, at least, were in on the plot.... It suddenly became very clear to him that the answer to the puzzle lay with the man who had ambushed him. He would have to get that man. Track him down.
Phil acted with decision. He got to his feet and strode rapidly to the deserted Guinness shack, horribly quiet and lonely now in the bright moonlight. In a minute he emerged with a flashlight at his belt and a rifle across his arm.
Once again he went over to the new black hole in the desert and looked down. From far below still came the purr, now fainter than ever. His friend, the girl he loved, were down there, he reflected bitterly, and he was helpless to reach them. Well, there was one thing he could do--go man-hunting. Turning, he started off at a long lope for the water-hole.
Ten minutes later he was there, and off to the side he found the marks of their scuffle--and small black blotches that could be nothing but blood. The other was wounded: could probably not get far. But he might still have his gun, so Phil kept his rifle handy, and tempered his impatience with caution as he set out on the trail of the widely spaced footprints.
They led off towards the nearby hills, and in the bright moonlight Phil did not use his flashlight at all, except to investigate other round black blotches that made a line parallel to the prints. As he went on he found his quarry's steps coming more closely together: becoming erratic. Soon they showed as painful drags in the sand, a laborious hauling of one foot after the other.... Phil put away his light and advanced very cautiously.
He wondered, as he went, who in the devil was behind it all. The radium-finding project had been kept strictly secret. Not another soul was supposed to know of the earth-borer and its daring mission into the heart of the earth. Yet, obviously, someone had found out, and whoever it was had laid at least part of his scheme cunningly. An old man and a girl cannot offer much resistance: he, Phil, would have been well taken care of had it not been for the water jug. So far, there were at least two in the plot: the man who had ambushed him and the unknown who had evidently kidnapped both Professor and Sue Guinness. But there might be still more.
There might be friends, nearby, of the man he was tracking. The fellow might have reached them, and warned them that the scheme hadn't gone through, that Phil was loose. They could very easily conceal themselves alongside their partner's tracks and train their rifles on the tracker....
The trail was leading up into one of the canons in the cluster of hills to the west. For some distance he followed it up through a slash of black below the steep moonlit heights of the hills to each side--and then, suddenly, he vaguely made out the forms of two huts just ahead.
Immediately he stooped low, and went skirting widely off up one side. He proceeded slowly, with great caution, his rifle at the ready. At any moment, he knew, the hush might be split by the cracks of waylaying guns. Warily he advanced along the narrow canon wall above the huts. No lights were lit, and the place seemed unoccupied. He was debating what to do next when his attention was attracted to a large dark object lying in the canon trail some twenty yards from the nearest hut. Straining his eyes in the inadequate moonlight, he saw that it was the outstretched figure of a man. His quarry--his ambusher!
Phil dropped flat, fearful of being seen. Keeping as best he could in the shadows, fearing every moment to hear the sharp bark of a gun, he crawled forward. It took him a long time to approach the sprawled figure, but he wasn't taking chances. When within twenty feet, he rose suddenly and darted forward to the man's side.
His rapid glance showed him that the fellow was completely out: and another quick look around failed to show that anyone else was watching, so he returned to his examination of the man. It was the ambusher, all right: a Mexican. He was still breathing, though his face was drawn and white from the loss of blood from a wound under the blood-soaked clothing near his upper right arm. A hasty search showed that he no longer had his gun, so Phil, satisfied that he was powerless for some time to come, cautiously wormed his way towards the two shacks.
There was something sinister in the strange silence that hung over them. One was of queer construction--a windowless, square, high box of galvanized iron. The other was obviously a dwelling place. Carefully Phil sneaked up to the latter. Then, rifle ready, he pushed its door open and sent a beam of light stabbing through the darkness of the interior.
There was no one there. Only two bunks, a table, chair, a pail of water and some cooking utensils met his view. He crept out toward the other building.
Come close, Phil found that a dun-colored canvas had been thrown over the top of it, making an adequate camouflage in daytime. The place was about twenty feet high. He prowled around the metal walls and discovered a rickety door. Again, gun ready, he flung it open. The beam from his flash speared a path through the blackness--and he gasped at sight of what stood revealed.
There, inside, was a long, bullet-like tube of metal, the pointed end upper-most, and the bottom, which was flat, toward the ground. It was held in a wooden cradle, and was slanted at the floor. In the bottom were holes of two shapes--rocket tubes and disintegrating projectors. It was another earth-borer.
Phil stood frozen with surprise before this totally unlooked-for machine. He could easily have been overcome, had the owner been in the building, for he had forgotten everything but what his eyes were staring at. He started slowly around the borer, found a long narrow door slightly ajar, and stepped inside.
This borer, like Guinness's, had a double shell, and much the same instruments, though the whole job was simpler and cruder. A small instrument board contained inclination, temperature, depth and air-purity indicators, and narrow tubes led to the air rectifiers. But what kept Holmes' attention were the wires running from the magneto to the mixing chambers of the disintegrating tubes.
"The fools!" he exclaimed, "--they didn't know how to wire the thing! Or else," he added after a moment, "didn't get around to doing it." He noticed that the projectile's interior contained no gyroscope: though, he thought, none would be needed, for the machine, being long and narrow, could not change keel while in the ground. Here he was reminded of something. Stepping outside, he estimated the angle the borer made with the dirt floor. Twenty degrees. "And pointed southwest!" he exclaimed aloud. "This borer would come close to meeting the professor's, four miles under our camp!"
At once he knew what he would do. First he went back to the other shack and got the pail of water he had noticed, and took this out where the Mexican lay outstretched. He bathed the man's face and the still slightly bleeding bullet wound in his shoulder.
Presently the wounded man came to. His eyes opened, and he stared up into a steel mask of a face, in which two level black eyes bored into his. He remembered that face--remembered it all too well. He trembled, cowered away.
"No!" he gasped, as if he had seen a ghost. "No--no!"
"Yes, I'm the man," Holmes told him firmly, menacingly. "The same one you tried to ambush." He paused a moment, then said: "Do you want to live?"
It was a simple question, frightening in its simplicity.
"Because if you don't answer my questions, I'm going to let you lie here," Phil went on coldly. "And that would probably mean your death. If you do answer, I'll fix you up so you can have a chance."
The Mexican nodded eagerly. "I talk," he said.
"Good," said Phil. "Then tell me who built that machine?"
"Senor Quade. Senor James Quade."
"Quade!" Phil had heard the name before. "Of course!" he said. "Guinness's old partner!"
"I not know," the Mexican answered. "He hire me with much money. He buy thees machine inside, and we put him together. But he could no make him work--it take too long. We watch, hear old man go down to-night, and--"
The greaser stopped. "And so he sent you to get me, while he kidnapped the old man and his daughter and forced them under the ground in their own borer," Holmes supplied, and the other nodded.
"But I only mean to tie you!" he blurted, gesturing weakly. "I no mean shoot! No, no--"
"All right--forget it," Phil interrupted. "And now tell me what Quade expects to do down there."
"I not know, Senor," came the hesitant reply, "but...."
"But what?" the young man jerked.
Reluctantly the wounded Mexican continued. "Senor Quade--he--I think he don' like thees old man. I think he leave heem an' the girl down below. Then he come up an' say they keeled going down."