"You leave me like thees?" the Mexican asked.

"Yes," Phil said, and started for the door.

"But what you going to do?"

Phil smiled grimly as he flung an answer back over his shoulder.

"Me?--I'm going to fix the wiring on those disintegrators in your friend Quade's borer. Then I'm starting down after him." He stopped and turned before he closed the door. "And if I don't get back--well, it's just too bad for you!"

And so, a little later, once more the hushed desert night was cleft by a furious bellow of sound. It came, this time, from a narrow canon.

The steep sides threw the roar back and back again, and the echoes swelled to an earth-shaking blast of sound. The oblong hut from which it came rocked and almost fell; then, as the noise began to lessen, teetered on its foundations and half-slipped into the ragged hole that had been bored inside.

The descent was a nightmare that Holmes would never forget. Quade's machine was much cruder and less efficient than the sphere David Guinness had designed. Its protecting insulation proved quite inadequate, and the heat rapidly grew terrific as the borer dug down.

Phil became faint, stifled, and his body oozed streams of sweat. And the descent was also b.u.mpy and uneven; often he was forced to leave the controls and work on the mechanism of the disintegrators when they faltered and threatened to stop. But in spite of everything the needle on the depth gauge gradually swung over to three thousand, and four, and five....

After the first mile Holmes improvised a way to change the air more rapidly, and it grew a little cooler. He watched the story the depth gauge told with narrowed eyes, and, as it reached three miles, inspected his rifle. At three and a half miles he stopped the borer, thinking to try to hear the noise made by the other, but so paralyzed were his ear-drums from the terrific thunder beneath, it seemed hardly any quieter when it ceased.

His plans were vague; they would have to be made according to the conditions he found. There was a coil of rope in the tube-like interior of the borer, and he hoped to find a cavern or cleft in the earth for lateral exploring. He would stop at a depth of four miles--where he should be very near the path of the professor's sphere.

But Phil never saw the needle on the gauge rise to four miles. At three and three quarters came sudden catastrophe.

He knew only that there was an awful moment of utter helplessness, when the borer swooped wildly downwards, and the floor was s.n.a.t.c.hed sickeningly from under him. He was thrown violently against the instrument panel; then up toward the pointed top; and at the same instant came a rending crash that drove his senses from him....

CHAPTER III

"_You Haven't the Guts_"

"Just as I thought," said James Quade in the silence that fell when the last echoes had died away, and the splinters of steel and rock had settled. "You see, Professor, this earth-borer belongs to me. Yes, I built one too. But I couldn't, unfortunately, get it working properly--that is, in time to get down here first. After all, I'm not a scientist, and remembered little enough of your borer's plans....

It's probably young Holmes who's dropped in on us. Shall we see?"

David Guinness and his daughter were speechless with dread. Quade had trained the searchlight on the borer, and by turning their heads they could see it plainly. It was all too clear that the machine was a total wreck. It had pitched over onto one side, its sh.e.l.l cracked and mangled irreparably. Grotesque pieces of crumpled metal lay all around it. Its slanting course had tumbled it within fifteen yards of the sphere.

In silence the old man and the girl watched Quade walk deliberately over to it, his automatic steady in his right hand. He wrenched at the long, narrow door, but it was so badly bent that for a while he could not get it open. At last it swung out, however, and Quade peered inside.

After a moment he reached in and drew out a rifle. He took it over to a nearby rock, smashed the gun's breech, then flung it, useless, aside. Returning to the borer, he again peered in.

Sue was about to scream from the torturous suspense when he at last straightened up and looked around at the white-faced girl and her father.

"Mr. Holmes is tougher than I'd thought possible," he said, with a thin smile; "he's still alive." And, as Sue gasped with relief, he added: "Would you like to see him?"

He dragged the young man's unconscious body roughly out on the floor.

There were several bad bruises on his face and head, but otherwise he was apparently uninjured. As Quade stood over him, playing idly with the automatic, he stirred, and blinked, and at last, with an effort, got up on one elbow and looked straight at the thin lips and narrowed eyes of the man standing above. He shook his head, trying to comprehend, then muttered hazily:

"You--you're--Quade?"

Quade did not have time to answer, for Sue Guinness cried out:

"Phil! Are you all right?"

Phil stared stupidly around, caught sight of the two who lay bound on the floor, and staggered to his feet. "Sue!" he cried, relief and understanding flooding his voice. He started towards her.

"Stand where you are!" Quade snapped harshly, and the automatic in his hand came up. Holmes peered at it and stopped, but his blood-streaked face settled into tight lines, and his body tensed.

"You'd better," continued Quade. "Now tell me what happened to Juan."

Phil forced himself to be calm. "Your pal, the greaser?" he said cuttingly. "He's lying on a bunk in your shack. He shot himself, playing with a gun."

Quade chose not to notice the way Phil said this, but a little of the suave self-confidence was gone from his face as he said: "Well, in that case I'll have to hurry back to the surface to attend to him. But don't be alarmed," he added, more brightly. "I'll be back for you all in an hour or so."

At this, David Guinness struggled frantically with his bonds and yelled:

"Don't believe him, Phil! He's going to leave us here, to starve and die! He told us so just before you came down!"

Quade's face twitched perceptibly. His eyes were nervous.

"Is that true, Quade?" Holmes asked. There was a steely note in his voice.

"Why--no, of course not," the other said hastily, uncertain whether to lie or not. "Of course I didn't!"

Phil Holmes looked square into his eyes. He bluffed.

"You couldn't desert us, Quade. You haven't the guts. You haven't the guts."

His face and eyes burned with the contempt that was in his words. It cut Quade to the raw. But he could not avoid Phil's eyes. He stared at them for a full moment, trembling slightly. Slowly, by inches, he started to back toward the sphere; then suddenly he ran for it with all his might, Holmes after him. Quade got to it first, and inside, as he yanked in the searchlight and slammed and locked the door, he yelled:

"You'll see, you d.a.m.ned pup! You'll see!" And there was the smothered sound of half-maniacal laughter....

Phil threw all his weight against the metal door, but it was hopeless and he knew it. He had gathered himself for another rush when he heard Guinness yell:

"Back, Phil--back! He'll turn on the side disintegrators!"

Mad with rage as the young man was, he at once saw the danger and leaped away--only to almost fall over the professor's p.r.o.ne body. With hurrying, trembling fingers he untied the pair's bonds, and they struggled to their feet, cramped and stiff. Then it was Phil who warned them.

"Back as far as you can! Hurry!" He grabbed Sue's hand and plunged toward the uncertain protection of a huge rock far in the rear. At once he made them lie flat on the ground.

As yet the sphere had not stirred nor emitted a whisper of sound, though they knew the man inside was conning the controls in a fever of haste to leave the cavern. But they hadn't long to wait. There came a sputter, a starting cough from the rocket tubes beneath the sphere.

Quickly they warmed into life, and the dully glimmering ball rocked in the hole it lay in. Then a cataract of noise unleashed itself; a devastating thunder roared through the echoing cavern as the rockets burst into full force. A wave of brilliant orange-red splashed out from under the sphere, licked back up its sides, and seemed literally to shove the great ball up towards the hole in the ceiling.

Its ascent was very slow. As it gained height it looked--save for its speed--like a fantastic meteor flaming through the night, for the orange plumage that streamed from beneath lit the ball with dazzling color. A glowing sphere, it staggered midway between floor and ceiling, creeping jerkily upwards.