The Ringworld Engineers

“I had not expected such ambition from a current addict.”

“We’ll start cautiously.” Cautiously for humans, Louis told himself; not for puppeteers. “Chmeee’s right: the machines could have been dumped as soon as they were through the rim wall, when the bacterium got to them.”

Chmeee said, “We should not try to take the lander through the rim wall. I have no faith in an alien machine a thousand years old. We must go over.”

The Hindmost asked, “How would you avoid the meteor defense?”

“We must try to outguess it. Louis, do you still believe that what fired on us was merely an automated defense against meteors?”

“I thought so at the time. It all happened so tanj fast!” Falling sunward, all a little edgy, daunted by the reality of the Ringworld. All but Teela, of course. A momentary flash of violet-white; then Liarwas embedded in tenuous violet-glowing gas. Teela had looked out through the hull. “The wing’s gone,” she’d said.

“It didn’t fire on us till we were on a course to intersect the Ringworld surface. It’s got to be automated. I told you why I think there’s nobody in the Repair Center.”

“Nobody to fire on us deliberately. Very well, Louis. Automatics would not be set to fire on the rim transport system, would they?”

“Chmeee, we don’t know who built the rim transport system. Maybe it wasn’t the Ringworld engineers; maybe it was added later, by Prill’s people—”

“It was,” said the Hindmost.

His crew turned to look at the puppeteer’s image on the screen.

“Did I tell you that I spent some time at the telescope? I have learned that the rim transport system is only partly finished. It runs along 40 percent of this rim wall, and does not include the section we occupy now. On the portward rim wall the system is only 15 percent complete. The Ringworld engineers would not have left so minor a subsystem half built, would they? Their own mode of transport may have been the same spacecraft used to supervise construction.”

“Prill’s people came later,” Louis said. “Maybe a lot later. Maybe the rim transport system got too expensive. Maybe they never actually completed their conquest of the Ringworld … but then why were they building starships? Oh, futz, we may never know. Where does this leave us?”

“It leaves us trying to out-think the meteor defense,” Chmeee said.

“Yah. And you were right. If the meteor defense made a habit of firing on the rim wall, nobody would have built anything there.” Louis chewed it a moment longer. There would be holes in his assumptions … but the alternative was to go through the wall via an ancient cziltang brone of unknown dependability. “Okay. We fly over the rim wall.”

The puppeteer said, “You suggest a fearful risk. I prepared as best I could, but I was forced to use human technology. Suppose the lander should fail? I hesitate to risk any of my resources. You would be stranded. The Ringworld is doomed.”

“I hadn’t forgotten,” Louis said.

“First we must search all of the spaceport ledges. There are eleven more ships on this rim wall, and an unknown number on the portward rim—”

And it would be weeks before the Hindmost satisfied himself that no transmutation system was to be found on those ships. Oh, well—

“We should go now,” Chmeee said. “The secret may be nearly within our grip!”

“We have fuel and supplies. We can afford to wait.”

Chmeee reached out and tapped controls. He must have pla

“You are being foolish,” the Hindmost’s liquid contralto reproved them. “I can turn off your drive.”

The lander slid clear of the curved docking hatch and lifted at a brutal four gees. When the Hindmost finished speaking, a fall would already have killed them. Louis cursed himself for not foreseeing this. Chmeee’s blood was bubbling with youth. Half the kzinti never grew up—they died in fights …

And Louis Wu, too engrossed in himself and his current-withdrawal depression, had let his options slip by him.

He asked coolly, “Have you decided to do your own exploring, Hindmost?”

The puppeteer’s heads quivered indecisively above his control board.

“No? Then well do it our way, thank you very much.” Louis turned to Chmeee and said, “Try landing on the rim wall” before he noticed the kzin’s peculiarly rigid attitude, blank eyes, and exposed claws. Rage? Would the kzin actually try to ram Hot Needle of Inquiry?

The kzin howled in the Hero’s Tongue.

The puppeteer answered in the voice of a kzin; changed his mind and repeated in Interworld. “Two fusion rockets, one mounted aft and one beneath. No thrusters. You need never fire the fusion motors on the ground except for defense. You may lift with repulsers, which repel the Ringworld floor material. You may fly as if using a negative gravity generator, but the repulsers are simpler in design, easier to repair and maintain. Do not use them now. They would repel the rim wall and thrust you into space.”

That explained Chmeee’s apparent panic. He was having trouble flying the lander. Not reassuring. But the spaceport ledge was far below, and an u

“We must not rise too far above the rim wall. Search the lockers, Louis. Inventory our equipment.”

“You’ll warn me before you do that again?”

“I will.”

Louis disengaged the crash web and floated down the stairwell.

Here was living space surrounded by lockers and an airlock. Louis began opening doors. The biggest locker held what must have been a square mile of fine, silky black cloth, and hundreds of miles of black thread on twenty-mile spools. Another locker held modified flying belts, with repulsers over the shoulders and a small thruster. Two small and one large. One for Halrloprillalar, of course. Louis found flashlight-lasers and handheld sonic stu

There were large rectangular repulsion plates—for towing cargo through the air? Spools of Sinclair molecule chain, like very thin, very strong thread. Small bars of gold: for trade? Binocular goggles with a light-amplification setting. Impact armor. Louis muttered, “He’s thought of everything.”

“Thank you.” The Hindmost spoke from a screen Louis hadn’t noticed. “I had many years to prepare.”

Louis was getting tired of finding the Hindmost wherever he went. Fu

Chmeee’s voice roared without benefit of microphone. “Louis, take your place!”

Louis glided up the stairwell. He was barely into his chair when Chmeee lit the fusion motors. The lander slowed and hovered just at the edge of the rim wall.

The top of the rim wall was broad enough for the lander, but not much more than that. And how was the Ringworld meteor defense taking all this?

They had been within the arc of the Ringworld, falling toward the i