“They sure are using young crewmen these days!” joked one of the scientists, a tall man who seemed to be working harder than the others. “Nice work, young folks!” The scientist was in the act of changing the children’s cords over to the returning cable when a slight mishap occurred. One of the crates coming over bumped into him. He laughed as he again got to his feet but his laughter quickly changed to alarm when Sue suddenly pushed off from the platform. She had thought her cable line was secure and that she was ready to make the exciting trip back across the gulf. “Wait, miss!” the scientist called. “I didn’t finish fastening your cable cord!” He reached for Sue but her suit slipped out of the fingers of his bulky space gloves. Steve froze for an instant in terror at what he had seen. Then without thought of anything else except his sister’s danger, he dove right off the platform after Sue, not realizing or caring that his own cable cord was not fastened. If the scientist had not grabbed for Sue she might have floated safely across to the freighter. But by touching her he had sent her off in a direction beneath it. Over his radio, Steve heard her screaming for help and saw her flinging her arms and legs about like a drowning swimmer. Steve was moving faster than she and presently caught up with her. “What are we going to do, Steve?” she cried, holding tightly to him. “We can’t stop! And it’s so dark out here!” Steve knew that unless someone came to their aid they would drift on and on since there was no air to slow them down. But he didn’t tell Sue this. He remembered, as he had at times before, that a spaceman must keep his head in an emergency. He spoke comforting words to Sue, telling her to try to be calm, that help would be coming. [Illustration: _He saw her flinging her arms and legs about like a drowning swimmer_] Even as he told her this a spear of light hit them and a voice broke in on their radio: “Steve! Sue! Stop struggling! I’m on my way to you!” “Biff!” Steve exclaimed, and the dread in his heart suddenly lifted. He looked over his shoulder and saw their big friend approaching, guided by the light that had been flashed on them from the freighter. There was a little plume of flame trailing behind him. In a few minutes he had caught up with them. Sue was so glad to see him she grabbed the big spaceman and her helmet bumped against his in an attempted kiss. “Oh, I’m so glad to see you, Biff!” she sobbed. “I was so _awfully_ scared!” “You’re all right now,” Biff said gently. “Both of you hold on to me and we’ll go back.” Steve took Biff’s left arm and Sue firmly grasped one of Steve’s. Biff carried a type of hand rocket, called a “pusher,” that he had used to shoot himself along toward them. By pointing the rocket in the opposite direction from which he wanted to go, the “pusher” pushed him in the manner of the rocket tubes on the freighter.