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"Light and warmth had this world in plenty, therefore, and with time life had risen on it, crude forms ascending through the channels of evolutionary change into a myriad different species, of which one species, the nebula-creatures we have seen, was the most intelligent. In time they ruled this strange world, wiping out all other species, and climbed to greater and greater science and power with the passage of time, their existence never suspected by any in the universe outside. Back and forth through the Galaxy went the great star-cruisers of the federated suns, but none ever dreamed of the strange race that had grown to power on this world at the fiery nebula's heart.

"But slowly, inexorably, destruction began to creep upon that race. As I have said, all nebulae contract always, and this one was still doing so, still growing smaller and smaller, its encircling fires closing steadily in upon the spinning world at their heart. Hotter and hotter it became on that world until life was hardly possible on it for the nebula-creatures, accustomed as they were to a milder temperature. They must escape that heat or perish, and since they could not escape to outer space through the prisoning fires around them they did the last thing available, hollowed out vast caverns in the interior of their world and descended into those caverns to live. The whole surface of their world they sheated with a smooth, heat-reflecting metal, and then descended in all their hordes into the countless mighty caverns that honeycombed all their great world, taking up their life again in those cool depths, safe from the nebula's heat.

"Ages passed over them while they lived thus in their world's depths, but still the nebula contracted, closed in upon them, in that vast, remorseless cycle that is nature's law throughout the universe. Closer and closer crept its fires toward the metal-sheathed world of the nebula people, until at last they saw that soon those fires would envelop their world and annihilate it, unless they were turned back in some way. So for a time they bent all their energies toward the problem of turning back the nebula's contracting fires, and at last found a way to do so, one which would take all their strength and science to carry out.

"In the surface of their metal-covered world they sank a vast, metal-walled pit, and in that pit set massed machines capable of generating an atomic ray of terrific power. From each of the generating-machines led a connection carrying the power produced by it, all these connections combining into the thick cable we saw which leads into the great cylinder-apparatus, generating inside it the mighty ray that stabs up toward the nebula, and into which we crashed. Now the great world here at the nebula's heart is already spinning, revolving, and the purpose of the nebula people was to use the great ray as a connection between their spinning world and the encircling nebula, to set the nebula to spinning also by this means, the ray being equal to a solid connection between the two. And their plan proved a sound one, for after the great ray had been put into operation the vast encircling nebula began to move slowly, to revolve, faster and faster as its turning accelerated under the constant impetus of the great ray.

"When the nebula should reach a certain speed of whirl, the nebula-creatures knew, when it should reach the critical point of its spin, it would be whirling so fast that it would not longer be able to hold its mighty mass together, and it would break up, disintegrate, its fiery mass flying off through the Galaxy in all directions. This would remove all danger from the nebula people, who could then live on without fear in their cavern-honeycombed world, using artificial light and heat. They knew, however, that once started the whirling of the nebula must be kept up until it had reached its critical point and had broken up, since if the whirling were slackened before then, the great ray turned off, the vast, ponderously turning nebula would collapse with the removal of the ray, its collapsing fires annihilating the nebula world inside it. For this reason the great machines in the pit that generated the power for the ray were made completely automatic and certain in operation, needing only a handful of the nebula-creatures to attend them.

"It was that handful that captured us when we came, our ship falling down to the great pit's floor after crashing into the terrific ray. And after we had been brought down here, after I had learned thus what terrible plan of these creatures it was that was bringing doom to our own universe, I lost my senses, sprang at the nebula king, unconscious of all but what I had just learned. And now you know what it was I learned, what we came here to learn. But we have learned too late, now, for in less than twenty hours the nebula's whirling will have reached its critical point, will have sent its vast flaming mass hurtling out across our universe, our Galaxy, in all directions, to carry destruction and death to all the peoples of our suns and worlds!"

The silence of our shaft-cell was suddenly heavy and brooding as the voice of Jor Dahat ceased. From above came the soft rustling of the guard there, gliding back and forth along the dim corridor, and faintly to our ears from the distant vast caverns came the clash and hum of the great machines there, with all their clamor of activity. At last, as though from a distance, I heard my own voice break the silence.

"Twelve hours," I said slowly. "Twelve hours-before the end." Then I, too, fell silent, and silently, hopelessly, we stared into each other's eyes.

Through the hours that followed, the same deathly silence hung over us, a silence intensified by the thing in all our thoughts, a silence deafening as the rumble of doom. Always now that scene comes back to me in memory as a strange, dim-lit picture-the dusky little well at the bottom of which we crouched, hardly able to make out each others' faces, the ceaseless humming activity from the great caverns beyond, the measured glide of our guard above. Hour passed into hour and we moved not, changed not, sitting on in dull, despairing silence. At last, weary as I was, I drifted off into restless sleep, tortured by vague dreams of the horrors through which we had come.

When I opened my eyes again it was to find Jor Dahat gently shaking me, crouched there beside me. As he saw me wake he bent his head to my ear. "Sar Than has a plan," he whispered to me. "We've hardly more than an hour left but he thinks that we have a chance that way to get out-a million to one chance. If we could-"

But by that time I was crawling over to the Arcturian's side, and eagerly we listened while in whispers he outlined his project for escaping from our pit-cell. Small enough chance there seemed that we could carry it out, and even were we to escape from our well-prison there seemed nothing but death awaiting us farther on, but we were of one mind that it would be better to meet our end thus than wait in the shaft tamely for death. Therefore, crouching against the wall, we waited tensely for the guard above to pass our shaft.

Pass he did, in a moment more, his monstrous shapeless body gliding to the shaft's edge and peering down there at us in passing, as usual. Then he was gone, gliding on down the corridor, and instantly we sprang to our feet. At once Jor Dahat stepped over to the wall, standing with his back against it and his feet braced widely on the floor. Then Sar Than climbed nimbly up over the plant-man's body until two of his four limbs rested on the shoulders, of Jor Dahat, who now grasped those two limbs in his own hands and raised them as high as he could reach, holding the Arcturian above him by the sheer force of his powerful muscles.