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 chamber, undoubtedly the work of human hands; a room awe-inspiring to behold, and even more than awe-inspiring in the reflections it forced upon their minds. Passages radiated on either hand to mysterious depths, and great bulks loomed in the spectral light. Justus Miles gave a low cry of amazement when a closer investigation revealed those bulks to be the wrecks of mighty and intricate machines, the use of which it was vain to conjecture. He looked at Ward.
"Solino spoke of a city down in the ocean. Can this be it?"