The adventurers accomplished the loading in a few minutes. "Now," came the voice of their employer, "stand on the gangway yourselves. Steady; don't move."

Under their feet they felt the gangway vibrate and withdraw from the land. For a moment they were in utter darkness; then a light flashed up and revealed a long, box-like room. The opening through which they had come had closed, leaving no sign of its existence.

In the center of the room stood a mechanism like a huge gyroscope, and a plunging piston, smooth and black, went up and down with frictionless ease. In front of what was evidently a control board sat a swarthy man with a large hairless head and peculiarly colored eyes. The adventurers stared in surprise, for this man, too, sat in a wheelchair, seemingly a cripple; but unlike Mr. Solino he wore no cloak, his body from the neck down being enclosed in a tubular metal container. The body must have been very small, and the legs amputated at the hips, since the container was not large and terminated on the seat of the peculiar wheel chair to which it seemed firmly attached.

Solino did not offer to introduce them to the man at the control board, who, aside from a quick look, paid them no attention. He ushered them ahead into another, though smaller cabin, and after indicating certain arrangements made for their comfort, withdrew. From the slight sway of the floor under their feet and the perceptible vibration of the craft, the adventurers knew they were under way.

"Well, this is a rum affair and no mistake about it," said one of them.

"A freak—a bloomin' freak," remarked another whose cockney accent proclaimed the Englishman.

"Yuh're shore right," said a lean Texan. "That hombre out there had no legs."

"Nor hands either."

Miles and Ward glanced at one another. The same thought was in both minds. Neither of them had ever seen Mr. Solino's hands. A rum affair all right!

Hours passed. Some of the men fell to gambling. At intervals they ate. Twice they turned in and slept. Then, after what seemed an interminable time, Solino summoned Miles and Ward to his presence in the control room. "It is time," he said, "that you should know more of the enterprise on which you have embarked. What I say, you can communicate to the other men. A year's salary for all of you lies to your credit at the Chase Bank of New York. And this money will not be your sole reward if you survive and serve faithfully."

"Thank you, sir," said Ward; "but now that we are well on our way to our destination, could you not tell us more about it? You have said something of a city, a country. Where is that country?"

"Down," was the astounding answer.

"Down?" echoed both men.

"Yes," said Solino slowly, "down. The gateway to that land is at the bottom of the ocean."

As the two men gaped at him, incredulous, an awful thing happened. With an appalling roar and a rending of steel and iron, the submarine halted abruptly in its headlong flight, reared upward at an acute angle and then fell forward with a tremendous crash. The adventurers were thrown violently against a steel bulkhead, and slumped down unconscious....

How long they lay there insensible they never knew. Justus Miles was the first to come to, and he found himself in Stygian blackness. "Rusty!" he called, feeling terribly sick and giddy. Only silence answered him. "Good God!" he thought, "what has happened?" His hand went out and recoiled from something soft and sticky. Gingerly he sat up. There was a lump on his head. His body felt bruised and sore but it was evidently sound. He recollected the small but powerful flashlight in his pocket, and drew it forth and pressed the button. A reassuring pencil of light pierced through the gloom. Even as it did so, someone groaned, and Ward's voice uttered his name.

"Is that you, Kid?"

"It's me, all right."

"You ain't hurt?"

"Nothing to speak of. How about you?"

"O. K., I guess. An awful headache."

"Can you stand up?"

"Yes."

Ward's face appeared in the ray of light, pale and blood-streaked.

"I wonder what happened."

"It sounded like a collision."

They stared at one another with fearful eyes. A collision while underseas in a submarine is a serious matter.

"Where's Solino?"

Justus Miles ran the beam of his torch this way and that, and saw that the room was in a fearful confusion. The gyroscopic mechanism had broken from its fastenings and rolled forward. Somewhere beneath its crushing weight lay the control board and the swarthy operator. Then they saw Solino, still in his overturned wheelchair, the cloak drawn tightly about himself and it; but the top of his head was crushed in like an eggshell. Justus Miles had touched that head when he stretched out his hand in the darkness.

He and Ward had been saved from death as by a miracle. Over their heads the great piston had hurtled, killing Solino and tearing through the steel partition into the chamber beyond, visiting it with death and destruction. One hasty examination of that place was enough. The men in there were dead.

Sick with horror, the two survivors faced the stark reality of their terrible plight. Trapped in an underwater craft, they saw themselves doomed to perish even more miserably than their companions. As the horrible thought sank home, a cool breath of air, suggesting the smell of stagnant salt water, blew through an opening created by the crushing of the plates in the vessel's hull—an opening larger than the body of a man. Miles and Ward stared at it with puzzled eyes. With such a hole in her hull, the boat should have been admitting water and not air. However, they approached the gap and examined it with their torches.

"Here goes," Ward said after a moment's hesitation, and clambered through the opening, followed by his friend. When they were able to make out their surroundings, they saw that they were in a vast tunnel or cavern, the extent of which was shrouded in darkness. How the submarine had left the ocean and penetrated to this cavern it was impossible to say; but evidently it had come so far over a shining rail, a break in which had caused the disaster. The cavern or tunnel was paved with disjointed blocks of stone which once might have been smooth and even, but which now were disarranged by time and slimy with dampness and seagrowths. In the clammy air Miles involuntarily shuddered. "Good Lord, Rusty, we're certainly up against it! The only fellow who could tell us our whereabouts is dead!"

Ward's jaw tightened. "That rail leads somewhere: it's our only hope. But first let us get our guns and some food."

They were fortunate enough to discover several thermos bottles unbroken. Hot coffee revived their fainting spirits. Treating their bruises and cuts as well as they could, they left the submarine or car—it seemed to have been convertible for use either in water or on rail—and trudged ahead.

Beyond the break that had caused the wreck, the rail stretched away into illimitable blackness. Over rough stones, stumbling into shallow pools of water, the light of their torches serving but faintly to show the depressing surroundings, the two men plunged. Neither of them was without fear, but both possessed the enduring courage of men habituated to facing danger and sudden death without losing control of their faculties.

Time passed, but they had no means of telling how much, since their wrist watches no longer functioned. But after a while they noticed that the grade was upward and the going easier. At the same moment, Ward called attention to the fact that, even without electric torches, it was possible to see. All around the two Americans grew a strange light—a weird, phosphorescent glow, revealing far walls and massive pillars.

Now they could see that they were in a vast