“Look!” he shouted. “They see! There is the flag!”
Ashton stared up with wide, feverish eyes. From an out-jutting point of rock on the lofty rim he saw a tiny white dot waving to and fro against the blue-black sky. The watchers above had seen the flash of the revolver shots and were fluttering the white flag in responsive signal. Though on the world above the sun beat down its full mid-afternoon flood of light, the two men in the abyss could see stars twinkling in the dark sky around the waving fleck of white. 307
Blake fired two shots in quick succession, the agreed signal that told the flag was seen. He then calmly seated himself and began to add together the vertical measurements taken during the descent of the gorge. But Ashton groaned and flung himself face downward on the rough stone.
Blake soon finished his sum in addition, and the result brought a smile to his serious face. He checked the figures with painstaking carefulness, and nodded, fully satisfied. Replacing book and pencil in the deep pocket of his shirt, he opened one of the packages of food. When he had laid out enough for a hearty meal, he looked at Ashton. The prostrate man had not stirred.
“Come, Lafe,” he called encouragingly. “Time to eat.”
Ashton lay still and made no response.
Blake raised his voice––“Come! You’re not going to quit. You’re going to eat. You must keep your strength to fight your way through and up out of here––to her!”
Ashton sullenly rose and came to sit down on the rock beside the outspread food. He was silent, but he ate even more heartily than his companion. When they had finished, Blake swung his pack and level on his shoulder, fired one shot, and stepped out into the swift but shallow river. Wading as far downstream as he could see to read the rod in the twilight of the 308 depths, he set up the tripod of his instrument on a rock and took the reading given him by Ashton.
The survey of the cañon itself had begun. Unappalled by the awful height of the mighty precipices on either side, undaunted by the uncertainty of escape, heedless of the gloom of the deep, of the tumult and rush and chill of the icy waters, the engineer boldly advanced to the attack of this abysmal stronghold of Primeval Nature, his square jaw set in grim determination to wrest from these hitherto inviolate depths that which he sought to learn. Whatever might follow, he must and would unlock the secret of the hidden waters. Afterwards might come death by slow starvation or the quick dashing down from some half-scaled precipice. That mattered not now. First must the engineer perform his work,––first must he execute the task that he had set himself for the conquest of the chasm that was likely to prove his tomb.
Vastly different in purpose, yet no less resolute than the engineer, Ashton joined zealously in the grim battle with the abyss––for battle it soon proved to be. Only in places was the subterranean river shallow and easy to wade. More often it foamed in wild fury down steep rapids, to fling itself over ledges into black pools; or, worst of all, it swirled deep and arrowy-swift between fanged rocks where the channel narrowed.