They went out to the entrance to the shaft leading toward the heart of the planet. The shaft had been built with the knowledge of only a few Sirenians and none of them were aware of its purpose, thinking rather that it was a means of defense. Nobody saw the Hetrarra and the genius Toshmere enter the elevator that carried them forever into the depths below the surface of the planet. Underwood and Illia came to the end of the page and Underwood swore softly as he thumbed through the few remaining sheets. There was no more about the ancient Demarzule and Toshmere. The writer of the history had apparently been one of the Sirenian scientists, a confidant and friend of Toshmere who had been close to him in those last days. He had been one of the few to witness the descent of the two into the depths of the planet, but he knew nothing of what happened when they reached the bottom and sealed the repository. _He did not know which one had survived in that mighty struggle that must have taken place below._ And shortly no one of the Sirenians cared what the fate of their deserting Hetrarra might have been, for the great Dragboran fleet was upon them. With the mighty, unknown weapon that struck terror to the mightiest of Sirenia, they sped out of space and swiftly nullified the Sirenian defenses. It was a carnage that was frightful even to the Sirenians, so schooled in the methods of shedding blood. Their defenses might not have existed for all the effect they had on their enemy. At first one by one, and then by tens, the operators were touched by death and their machines turned to molten ruin. At last, when only incandescent metal and sprawling dead lay of the Sirenian fleet, the enemy ships withdrew, and the handful of survivors dared hope that there might be escape for them. * * * * * But there was none. As the fleet withdrew beyond their vision, a single small ship appeared in the heavens and they screamed with the knowledge of what it was. But they were dead long before the planet exploded into its component fragments which hurtled in all directions into space. Underwood put the manuscript down, his mind reluctant to close the scene of vast and terrible battle that had occurred so long ago. It had answered some of the problems raised by asteroidal archeology. It explained the utter lack of relationship between Stroid III, which was the language of the Sirenians, and Stroid I and II, which were undoubtedly native to the vanished planet. But this snatch of history prepared by the unknown scientist companion of Toshmere raised the greatest enigma of all. Illia's eyes looked up into Underwood's. "Who could have won?" she said. "If it was Toshmere, the alien will be all that we hoped he would be. If it is Demarzule, then Terry is right--he should be destroyed."