"As you like," replied Sime quietly, and again quite master of himself. "Look out for snakes. I will carry the light and you can keep yours handy in case you may need it."
Dr. Cairn drew himself up into the entrance. The passage was less than four feet high, and generations of sand-storms had polished its sloping granite floor so as to render it impossible to descend except by resting one's hands on the roof above and lowering one's self foot by foot.
A passage of this description, descending at a sharp angle for over two hundred feet, is not particularly easy to negotiate, and progress was slow. Dr. Cairn at every five yards or so would stop, and, with the pocket-lamp which he carried, would examine the sandy floor and the crevices between the huge blocks composing the passage, in quest of those faint tracks which warn the traveller that a serpent has recently passed that way. Then, replacing his lamp, he would proceed. Sime followed in like manner, employing only one hand to support himself, and, with the other, constantly directing the ray of his pocket torch past his companion, and down into the blackness beneath.
Out in the desert the atmosphere had been sufficiently hot, but now with every step it grew hotter and hotter. That indescribable smell, as of a decay begun in remote ages, that rises with the impalpable dust in these mysterious labyrinths of Ancient Egypt which never know the light of day, rose stiflingly; until, at some forty or fifty feet below the level of the sand outside, respiration became difficult, and the two paused, bathed in perspiration and gasping for air.
"Another thirty or forty feet," panted Sime, "and we shall be in the level passage. There is a sort of low, artificial cavern there, you may remember, where, although we cannot stand upright, we can sit and rest for a few moments."
Speech was exhausting, and no further words were exchanged until the bottom of the slope was reached, and the combined lights of the two pocket-lamps showed them that they had reached a tiny chamber irregularly hewn in the living rock. This also was less than four feet high, but its jagged floor being level, they were enabled to pause here for a while.
"Do you notice something unfamiliar in the smell of the place?"
Dr. Cairn was the speaker. Sime nodded, wiping the perspiration from his face the while.
"It was bad enough when I came here before," he said hoarsely. "It is terrible work for a heavy man. But to-night it seems to be reeking. I have smelt nothing like it in my life."
"Correct," replied Dr. Cairn grimly. "I trust that, once clear of this place, you will never smell it again."