Eleven hours of incessant labor, care, watchfulness and fatigue, three hours of flight and eight of coasting into the terrific depths, brought Allan once more through the fogs, the dark, the heat, to sight of the vast sunken sea, five hundred miles below the surface.
Throughout the whole stupendous labor he thanked Heaven the girl was safely left behind, nor forced to share this travail and exhaustion. Myriad anxieties and fears assailed him--fears he had taken good care not to let her know or dream of.
Always existed the chance that something might go wrong about the machine and it be hurled, with him, into that black and steaming sea; the possibility of landing not among the Folk, but in some settlement of the Lanskaarn on the rumored islands he had never seen; the menace of the Great Vortex, of which he knew nothing save the little that the patriarch had told him.
All these and many other perils sought to force themselves upon his mind. But Allan put them resolutely back and, guided by his instruments, his reason, and that marvelous sixth sense of location which his long months of battling with the wilderness had brought to birth in him, swiftly yet carefully slid in vast spirals down the purple, then the black and terrifying void that yawned interminably below.
The beam of his underslung searchlight, shifting at his will, shot its white ray in a long, fading pencil downward as he coasted. And hour after hour it found nothing whereon to rest. It, too, seemed lost forever in the welter of uprushing, choking vapors from the pit.
"Ah! At last!"
The cry, dull in that compressed air, burst triumphantly from his lips as the light-ray, suddenly piercing a rift of cloud, sparkled dimly on a surface shiny-black as newly cleft anthracite.
Allan threw in the motor once more and quickly got the Pauillac under control. In a long downward slant he rushed, like some vast swallow skimming a pool, over the mysterious plain of steaming waters. And ever, peering eagerly ahead, he sought a twinkle of the fishermen's oil-flares wimpling across the sunken sea.
Moment by moment he consulted his instruments and the chart he had stretched before him under the gleam of the hooded bulbs.
"Inside of half an hour now," said he, "I ought to sight the first flash of the flares upon the parapet--the glow of the flaming well!"
And a singular eagerness all at once possessed him, a strange yearning to behold once more the strange, fog-shrouded, reeking City of the Lost People, almost as though it had been home, as though these white barbarians had been his own people.