dimness of the shaft and found what he was looking for; a frail-looking steel ladder which extended in both directions up and down the shaft. Looking up, he tried to pierce its puddled blackness but could see nothing. If a dropper should hurtle down out of that blackness, he would be smashed to a bloody pulp. Grimly he thrust the thought out of his mind, slung the blaster over his shoulder, and leaped for the ladder on the far wall of the shaft. It trembled dangerously as his writhing body struck it and swiftly he began his long climb into the darkness above. For what seemed an eon of agonizing effort, Pell hauled his weary body up the length of the steel ladder. It stretched up and away into an infinity of blackness that housed a sudden and terrible death. As he climbed, Pell strained his senses in the all-enveloping darkness but could perceive nothing. Suddenly his hand, groping for another rung, met nothing but emptiness and for one terrifying moment Pell tottered off balance on the ladder. Cautiously he felt about above himself and his hand collided with the underside of a dropper which was suspended just over his head. Had he reached the top? It was impossible to tell in the blackness. He had no choice but to chance it. Saying a silent prayer, Pell unlimbered the blaster and wrapped himself about the tiny steel ladder as tightly as possible. Then he loosed its devastating radiance at the wall opposite him. The brilliance of its destructive flash blinded him momentarily as he clung tenaciously to the frail ladder which whipped treacherously. Blessed, precious light filtered in through the shattered door opposite him. Clinging tightly to his blaster, Pell leaped for the opening in spite of the fact that his eyes had not yet adjusted to the sudden light. Pain jagged his eyeballs as his pupils strove to contract but Pell ignored it as he took in his new surroundings with rapid glances. The corridors of this wide, well-lit level were deserted and the air was free of the deadly gas that had trapped him lower in the labyrinth. Haste was the keynote now. From this point on, regardless of what he did, he must do it quickly and decisively. He realized that he had not yet reached the surface, although he knew he was very close. His eyes narrowed as he considered the situation. He couldn't use the stairs since they were flooded with gas. And at any minute he might see the deadly, white tendrils of the gas issuing from the vents. There was only one thing to do.