"I gave him an assuring nudge and we edged our way along the wall of the circular chamber, maintaining a safe distance from the whirling machinery for it seemed possessed with a powerful magnetism. I would like to have studied it closer, but something seemed to warn me to remain a safe distance away from whirling cylinders which spun like electrical generators with the tubes connected like generating brushes. "I was still awed over the sudden disappearance of the Jovians and felt that their absence spelled some sinister disaster to us. I momentarily expected some of them to appear and seize us. "Suddenly we came to an exit shaft just high enough to admit a Jovian, without bending. I raised an arm to estimate the height of the ceiling. My fingertips just scraped it. The tunnel was in total darkness and this appeared to be the only exit from the chamber with the exception of the one through which we had entered. We clung, hand in hand, as we went into it. We had not gone more than a dozen steps until we were enveloped in an inky blackness. Certainly, I thought, the Jovians must be aware, through their peculiar mental telepathy, that we were exploring their secret chambers. Why didn't they swoop down upon us and challenge our progress? Perhaps, I thought, they did not figure it worthwhile, believing that we would eventually lose ourselves in the network of underground vistas, tunnels and chambers, and die as the result. It was a grim outlook for both of us at best, but I had one thing--the assurance of Abaris himself, that the Jovians had no intention of harming us seriously. "Eventually we became somewhat accustomed to the inky blackness of the tunnel and we were able to make out the forms of each other. Staring straight ahead I discovered what I accepted to be a small circular hole through which came a faint luminosity. We made for it as rapidly as we could, although we were extremely cautious and fearful lest we step into one of the bottomless abysses which I felt existed in the underground world. "We edged our way along the tunnel for perhaps a quarter of a mile before we eventually came to the circular light which we had seen. I was not surprised when we found that it was an entrance or an exit of another chamber! We approached it carefully not knowing what might lie ahead. We had no intention of exposing ourselves to the ire of Abaris could we help it. We wanted to find Allie Lane and her father--now that he too was alive! I crawled on hands and knees to the tunnel outlet. Sands was on the opposite side of the hole. We peered intently into the chamber which was brilliantly lighted. The white brightness of the light gave me an impression that it emanated from the sun! It blinded us temporarily.