The Federation cruisers should be arriving. He studied his chronometer. No, the nearest one, the _Sagittarius_ from Mercury, wasn’t due for another ten minutes or so. He turned up his helmet communicator and ordered all hands to watch for the exhaust of a nuclear drive cruiser, then turned it down again and gave Koa instructions. "Have Trudeau turn his load over to a Connie and collect the exploders and the dynamo. We’ll need wire, too. Who has that?" "Another Connie." "Get a reel. Cut off a few hundred feet and connect the dynamo to one end and an exploder to the other." The crystal came around again and Kemp got to work. Rip stood by, again reviewing all steps. They couldn’t afford to make a mistake. He had no margin of error. Kemp finished the hole a few seconds before the crystal turned into the sunlight again. Rip told him to keep the torch going. There might be some last minute cutting to do. Then the lieutenant hurried off at an angle to where Dominico was plodding along with the fuel tubes. Koa had turned the tube he carried over to a Connie. Rip got it, and told Dominico to follow him. Then he angled back across the asteroid to where Kemp was holding position. The asteroid turned twice before Koa arrived. He had a coil of wire slung over his arm and he carried the dynamo in one hand and an exploder in the other, the two connected by the wire. Rip took the exploder. "Uncoil the wire," he directed. "Go to its full length at right angles to the hole. We have to time this exactly right. When the crystal comes around again, I’ll shove the tube into the hole, then scurry for cover. When I’m clear I’ll yell and you pump the dynamo. Dominico and Kemp stay with Koa. Make sure no one is in the way of the blast." Koa unreeled the wire, moving away from Rip. The lieutenant pushed the exploder into one end of the fuel tube and crimped it tightly with his gloved hand. Koa and the others were as far away as they could get now, the wire stretching between them and Rip. Kemp had made sure no one was running near the line of blast. Rip watched for the crystal. It would be coming around any second now. He held the tube with the exploder projecting behind him, ready for the hole to appear. Koa’s voice echoed in his helmet. "All set, Lieutenant." "So am I," Rip answered. "Stand by." The crystal appeared across the sun line and moved toward him. He met it, slowed his speed, put the end of the tube into the hole and shoved. Kemp had allowed enough clearance. The tube slid into place. Rip turned and angled off as fast as he could glide. When he was far enough away from the blast line he called, "Fire!" [Illustration: "Fire!" Called Rip] "Fire!" Called Rip Koa squeezed the dynamo handle. The machine whined and current shot through the wire. A column of orange fire spurted from the crystal.