But surely this terrible heat could not be borne for any length of time. This was a stifling oven. There had to be cooler sections, or it would be impossible to live. He discarded his sopping uniform, took up his book, and made his way out of the room. At the exit he touched the wall cautiously: it was hot, but not burning, and the greenish slime continued to glow for a few seconds on his fingers. The heat was evidently not from cavern chemicals.

He found himself in a short tunnel. He had been told that Chthon consisted of a maze of lava tubes, and intellectually he knew that their formation had been completed many centuries before, but it was hard to be objective. The far end of the passage pulsed with heat, and the roaring sound grew constantly louder, as though the primeval forces were still in motion. But there was no other way to go.

At length he emerged into a larger cross tunnel, a dozen feet in diameter—and was smashed into its smooth wall by a rushing mass of air. Wind—in closed caverns? This was the source of the noise; but where could such a draft be coming from? Somehow his vision of the infernal region had not included this.

Aton braced himself and forged back into the wind, letting it guide his body down the tunnel. The walls were featureless, except for the glow, and the passage was almost exactly circular in cross section. Could it have been excavated and smoothed by an untold era of wind erosion? Chthon was growing stranger yet.

The fierce breeze—thirty miles an hour or more—served nicely to cool his laboring body, giving him at least part of the answer to survival here. But almost immediately he felt its consequence: dehydration. He would have to have water, and quickly, before his body shriveled. Somewhere there should be other people, and suitable provisioning.

Moving along with one hand against the wall, Aton suddenly fell into an inlet. The wind subsided here, and the heat returned; but grateful for the rest, he decided to follow it on down. The passage was small, hardly high enough to clear his head, and opened into another cell or room similar to the one in which he had been deposited originally. A dead end.