The buzzing sound which they had first heard now seemed accentuated, but, instead of being outside of the listeners, seemed inside them, hammering against their very brains! Messages were being sent to them, or passed back and forth between and among the cube-men about them--and they hadn't the slightest idea how to make answer, know whether an answer was expected of them, or what the cube-men thought about them! Since there was nothing else to do, they lay there, hands clasped, as children in the dark clasp hands, and waited for what might transpire. * * * * * Suddenly the discord from the inside of the crater ceased, and all was still, while it came to Sarka that the cube-men who stood before him were in grim communication with something invisible to Sarka and Jaska, somebody, perhaps, deep in the bowels of the Moon, over inside the crater. They knew, those two, that the cube-soldiers were reporting their presence, and asking instructions; that the Moon had gone silent to listen, and that within a few moments their fate would be decided. What should they do? In his hand Sarka held his ray director, with which he knew he could blast one or all of the cubes into nothingness. But still he held his hand, made no move. Something, however, had to be done, for the discord was starting again, growing in volume. It made Sarka think, oddly enough, of a deaf mute fighting for speech! Then came the first intelligible sound.... A burst, from the depths of the crater, of sardonic laughter! "Dalis!" said Sarka, and moved. While Sarka moved, Jaska held fast to his arm. Casting her fear to the winds, furious because of the laughter of Dalis, Sarka thrust his ray director back into his belt and stood upright. Bending over he seized the first of the gleaming cubes and hurled it over the edge of the crater, saw it start plummeting down. But even before it fell out of sight within the crater its gleam had dulled until it was almost impossible to see the thing. Racing as though racing against time, Sarka caught up cube after cube and hurled them all after the first. * * * * * Out of the crater there came no sound of heavy objects striking, though Sarka felt there should have, for the cubes were almost as heavy as a man. Then his hair almost stood on end under his helmet, for under that first aircar, where he had first seen it, the initial cube was again gleaming into life! The thing had dissolved while being hurled over the rim, and reformed in its proper place, its station as silent sentinel under the aircar!