Then the hell-mouth gloom began to grow faintly luminous, and the waterfall's thunder burst on their ears from close at hand. They emerged into fresh wet air and a sea of sound, on a rock ledge like the one above. Ismail raised the torch and waved it. The fire and smoke wandered up, until they flattened on a moving opal dome, that prisoned all the noises in the world.
“Earth's Drink!” he announced, waving the torch and then shutting his mouth tight, as if afraid to voice sacrilege.
It was the river, million-colored in the torch-light, pouring from a half-mile-long slash in the cliff above them and plunging past them through the gloom toward the very middle of the world. Its width was a matter of memory, and its depth unguessable, for although dim moonlight filtered through it, he did not know where the moon was, nor how far such light could penetrate through moving water. Somewhere it met rock-bottom and boiled there, for a roar like the sea's came up from deeps unimaginable.
He watched the overturning dome until his senses reeled. Then he crawled on hands and knees to the ledge's brink and tried to peer over. But Ismail dragged him back.
“Come!” he howled; but in all that din his shout was like a whisper.
The fear of the falls was on the Afridi, and he tugged at King's arm in a frenzy of impatience. Suddenly he let go and broke into a run. King trotted after him, afraid too, to look to right or left, lest the fear should make him throw himself over the brink. The thunder and the hugeness had their grip on him and had begun to numb his power to think and his will to be a man. Suddenly when they had run a hundred yards, Ismail turned sharp to the right into a tunnel that led straight back into the cliff and sloped uphill. As the din of the falls grew less behind him and his power to think returned, King calculated that they must be following the main direction of the river bed, but edging away gradually to the right of it. After ten minutes' hurrying uphill he guessed they must be level with the river, in a tunnel running nearly parallel.
He proved to be right, for they came to a gap in the wall, and Ismail thrust the torch through it. The light shone on swift black water, and a wind rushed through the gap that nearly blew the torch out. It accounted altogether for the dryness of the rock and the fresh air in the tunnel. The river's weight seemed to suck a hurricane along with it--air enough for a million men to breathe.
