"Yes." Imee came darting back to us, smiling. "Since before the Teemorn, my people were here. A Rorn we made prisoner once told us his people discovered it first. They went into this strange skeleton, and inside were many blocks of very bright stone." She pictured quite clearly bars of dully-glinting bullion. Evidently the captive had told his story well. * * * * * "These stones, which were so bright, the Rorn took to their city, which is three swims distant." How far that might be, I could not even guess. A swim, it seemed, was the distance a Teemorn could travel before the need for rest became imperative. "There were many Rorn, and they each took one stone. And of them, they made a house for their leader." The leader, as she pictured him, being the most hideous travesty of a thing in semi-human form that the mind could imagine: incredibly old and wrinkled and ugly and gray, his noseless face seamed with cunning, his eyes red rimmed and terrible, his teeth gleaming, white and sharp, like fangs. "A whole house, except the roof," she went on. "It is there now, and it is gazed at with much admiration by all the Rorn. All this our prisoner told us before we took him, with a rock made fast to him, out over the Place of Darkness. He, too, was very proud of their leader's house." "Treasure!" I commented to Mercer. "If we could find the city of the Rorn, we might make the trip pay for itself!" I could sense his wave of amusement. "I think," he replied, "I'd rather stand it myself. These Rorn don't appeal to me." It was over half an hour before we were at last free of our diving suits. The first thing Captain Bonnett said: "We've got to get to the surface, and that quickly. Our air supply is running damnably low. By the time we blow out the tanks we'll be just about out. And foul air will keep us here until we rot. I'm sorry, sir, but that's the way matters stand." * * * * * Mercer, white-faced and ill, stared at him dazedly. "Air?" he repeated groggily--I knew just how he felt--"We should have lots of air. The specifications--" "But we're dealing with facts, not specifications, sir," said Captain Bonnett. "Another two hours here and we won't leave ever." "Then it can't be helped, Captain," muttered Mercer. "We'll go up. And back. For more compressed air. We must remember to plot our course exactly. You kept the record on the way out as I instructed you?" "Yes, sir," said Captain Bonnett. "Just a minute, then," said Mercer. Weakly he made his way forward to the little cubbyhole in which was housed the central station of his thought-telegraph. I didn't even inspect the gleaming maze of apparatus. I merely watched him dully as he plugged in an antenna similar to the one we had left with Imee, and adjusted the things on his head. * * * * *