He heard a whirring sound, and saw the magnetic mooring cables jerk. The ship was preparing for blastoff. Automatic motors were drawing the cables and grappling plates into the hull. Moving quickly, Tom reached the rear cable. Here was his anchor, something to hold him tight to the hull! With one hand he loosened the web belt of his suit, looped it over a corner of the grappling plate as it pulled in to the hull. The plate pulled tight against the belt. Each plate fit into a shallow excavation in the hull, fitting so tightly that the plates were all but invisible when they were in place. Tom felt himself pulled in tightly as the plate gripped the belt against the metal, and the whirring of the motor stopped. For an instant it looked like the answer. The belt was wedged tight ... he couldn't possibly pull loose without ripping the nylon webbing of the belt. But a moment later the motor started whirring again. The plate pushed out from the hull a few inches, then started back, again pulling in the belt.... A good idea that just wouldn't work. The automatic machinery on a spaceship was built to perfection; nothing could be permitted to half-work. Tom realized what was happening. Unless the plate fit perfectly in its place, the cable motor could not shut off, and presently an alarm signal would start flashing on the control panel. He pulled the belt loose, reluctantly. He would have to count on his boots and his hand-pads alone. He searched the rear hull, looking for some break in the polished metal that might serve as a toehold. To the rear the fins flared out, supported by heavy struts. He made his way back, crouching close to the hull, and straddled one of the struts. He jammed his magnetic boots down against the hull, and wrapped his arms around the strut with all his strength. Clinging there, he waited. It wasn't a good position. The metal of the strut was polished and slick, but it was better than trying to cling to the open hull. He tensed now, not daring to relax for fear that the blastoff accelleration would slam him when he was unprepared. Deep in the ship, the engines began to rumble. He felt it rather than heard it, a low-pitched vibration that grew stronger and stronger. The Ranger would not need a great thrust to move away from the orbit-ship ... but if they were in a hurry, they might start out at nearly Mars-escape.... The jets flared, and something slammed him down against the fin strut. The Ranger moved out, its engines roaring, accellerating hard. Tom felt as though he had been hit by a ton of rock. The strut seemed to press in against his chest; he could not breathe. His hands were sliding, and he felt the pull on his boots. He tightened his grip desperately. This was it. He had to hang on, _had_ to hang on....