by Isaac Asimov
The next step was to find a place to stay, and then to pick up a few of the basic necessities. He had, after all, fled Hades with nothing but the clothes he was in, and a certain amount of cash. But Fiyle had lost everything he had a time or two before, and would quite likely do so again. The prospect did not bother him overmuch. There ought to be plenty of work in this town, seeing how the whole damn place was going to have to be packed up and shipped—
A hand came down on his shoulder. A man’s hand, small and thin-fingered, but wiry and strong.
“Dr. Ardosa,” a cool, unpleasant voice said in his ear. “Dr. Barnsell Ardosa. What a remarkable surprise to see you here, of all places. Except I suppose you’re not using that name anymore. Have you gone back to Norlan Fiyle for the time being? Or haven’t you picked out a new one yet?”
Fiyle turned around, and looked down just a trifle, straight into the eyes of Jadelo Gildern, the Ironhead chief of security. “Hello, Gildern,” he said slowly. “I suppose I might just as well stick with Norlan Fiyle, at least with you.”
Gildern smiled unpleasantly. “That makes sense to me,” he said. “But don’t you worry,” he said. “No one else needs to know who you really are—the Inferno police, for example, or the Settlers—as long as you keep me happy. Does that sound fair?”
“Yeah, sure,” said Fiyle, his voice a monotone.
“Good,” said Gildern. “Very good. Because until this very moment I was worrying about how I was going to staff things around here. It’s hard to find people with the right aptitude for intelligence work—especially among people who also have a strong motivation for keeping their employers happy.”
“Employers?” asked Fiyle, a cold, hard, knot forming in his stomach.
“That’s right,” said Gildern. “It’s your lucky day, Norlan. A very nice job opportunity has just fallen into your lap. Just between you and me, I don’t see how you can turn it down.”
Gildern stepped alongside Fiyle and put his hand on Fiyle’s forearm. It looked like a gentle, even friendly, gesture, but the fingers on his arm clamped down as tightly as any vise.
Jadelo Gildern led Norlan Fiyle away. And it was abundantly and unpleasantly clear to Norlan that he was nowhere near getting out of the game.
Part 3.
Impact Minus Thirty
14
THIS IS REAL, Davlo Lentrall told himself, once again. For the first time in your life, you are part of something real. You’re one of the ones actually doing the job. He sat down, exhausted, at the wardroom table, and set his tray down in front of him. Something Kaelor died to prevent, because it could kill so many. Davlo blinked and shook his head. It was hard to keep thoughts like that at bay. He knew he should eat, knew he needed to keep his strength up in order to keep working, but he was too tired to be hungry. He would just sit a moment by himself, before he forced himself to eat. He was in bad shape and losing weight, he knew that. But it took a real effort of will to care.
Why had they sent him here? Governor Grieg himself had suggested—or rather, politely ordered—that Davlo should join the spaceside part of the operation. Davlo was not entirely sure why. Had the governor thought it would be some sort of reward—rather than a torment—for Davlo to see the thing he had dreamed of taking place? Had the governor, quite accurately, perceived Davlo as borderline unstable, someone who might best be put out of the way before some clutch of reporters got their claws into him?
He looked out the porthole of the Settler spaceship, looked out into space, out at the realest thing he had ever seen in his life. There it was, just ten kilometers away. Comet Grieg, an ice mountain cruising through the darkness of space.
It was no abstraction inside a computer, no simulated image in a holographic generator. It was real. It was there. And it was huge, far larger than he had imagined it being, far larger than mere numbers could have told him. It took up half the sky, and seem to take up more. It was a dark, brooding shape of dirty gray, half lost in shadow. A monster out of the darkness, and, thanks to him, it was aimed straight at Inferno.
It was, roughly speaking, an oblong spheroid, but that made the shape of it sound simple and abstract. It was a real world, if a small one, with a geography complicated enough to have kept a generation of mapmakers busy. Its surface was so pocked with craterlets and covered in crags arid gullies and cracks that it was hard to study anyone feature on the surface before it got lost among all the others.
Comet Grieg was one of a special class of so-called “dark” comets. Inferno’s star system had plenty of normal comets, of the classic “dirty snowball” type composed primarily of water ice and other volatiles. But for reasons that still were not entirely understood, star systems with poorly developed planetary systems also seemed to produce a large number of dark comets—and Inferno shared its star with only two planets barely large enough to qualify as gas giants, a wizened little asteroid belt, and the usual sorts of deep space debris-comets, asteroids, planetesimals, and so on.
Called “dark” because they produced relatively small tails, and were composed of darker material, dark comets were closer to being asteroids encased in ice than anything else. Grieg had a particularly large proportion of stony material, but it contained plenty of water ice and other volatiles. A hazy nimbus of gas and dust and ice shards floated about the behemoth, bits of debris from the size of molecules up to the size of small aircars that had either been knocked loose by the natural heating and outgassing as the comet neared the sun, or else thrown clear by human interference.
A searchlight from a closer-in ship stabbed through the cloud of debris and struck the surface of Comet Grieg, flooding one small area on the surface with a light so bright, so clear, it did not seem to belong on such a darkened surface. A smooth and perfect cylindrical shape stuck up out of the comet’s surface. Davlo recognized it. It was one of the dozens of thrusters planted on the comet’s surface. He had helped calculate their placement, and played at least a small part in working out the firing sequence that had been used to eliminate the comet’s spin. It had been in a wobbling two-axis tumble when the task force had arrived. Now the spin had been restored and refined, and the comet’s nose was pointed straight at the sun.
But the sun would have no further chance to melt this comet. Davlo looked from Comet Grieg to the sunshade, a huge and insubstantial parasol floating in space a kilometer or so sunward of the comet, forming a permanent solar eclipse as seen from the surface of Grieg.
Left to its own devices, Grieg would have melted and boiled and sublimed away a substantial amount of material by now, forming a coma that would, in turn, have been blown back by the solar wind into a modest tail. But the sunshade stopped all that, and kept the comet in the deep freeze.
The parasol was itself being blown back by the solar wind, slowly drifting in toward the comet. In about another day or so it would come into contact with the comet, moving far too slowly for it to be called a crash. The parasol would drape itself around the comet like a small handkerchief dropped onto a large egg. It would tear in places, and the work crews would cut deliberate holes in it where it served their purposes, but that would be of no consequence. The parasol would reflect sunlight just as handily, losing only a few percentage points of its effectiveness.
Davlo Lentrall could not help but wonder what Kaelor would have thought of all this. He would have had some sardonic comment to make, no doubt, some dour turn of phrase that would capture the weaknesses in the plan in fewer words than anyone else. Or, Davlo wondered, was he making Kaelor too human? Kaelor had died in a futile attempt to prevent the comet capture. It stretched credulity to the breaking point to imagine he could be witness to the event, first hand, without the Three Laws taking hold of him, forcing him to desperate action. Davlo Lentrall was finding it more and more easy to understand desperation, and how it might drive someone to do something dangerous.
But one did not have to think on the grand scale to see this was no place for robots. Davlo looked out the port again, an
d spotted two tiny, space-suited figures moving some huge and unidentifiable piece of machinery about on the surface of the comet. A misplaced step, a crack in a faceplate, a shove to the machine that was a trifle too hard, and one or both of them would be dead. It was impossible to imagine any modem robot allowing humans to do anything so risky.
Davlo glanced at the wall chronometer, and realized that his break was nearly over. More out of duty than desire, he began to eat, the motion mechanical, the taste of the food unnoticed. Back to work. He would have help with the final check-calculations for the placement of the main detonation thrusters. It should have been humbling, galling even, for Dr. Davlo Lentrall, the man who had seen the potential of Comet Grieg, the man who had dreamed the dream and planned the plan, to be assigned a position as minor as assistant calculation engineer. Glory and accolades should have been his.
But, somehow, he no longer saw it that way. Others here, mostly the Settlers, were far more skilled at handling the detailed mathematics of moving a small world through space. He saw his position as a penance, and a fitting one. How brilliant and noble could his vision have been if his closest associate was willing to die in order to stop it? Davlo found himself embarrassed and ashamed whenever someone recognized him and congratulated him on his grand plan. Most of the crew had learned to avoid the subject, and, indeed, had learned to avoid Davlo.
But he had been sent here to do work, and he had agreed to do it. So he accepted the tasks he was given, and did them as best he could. Besides, work got his mind off things. He could worry about solving the equation, determining the proper thrust and orientation. Off-shift was the worst, nights spent staring into the darkness, thinking of all the ways things could go wrong. No, he wanted no congratulations.
Something inside him had changed. Or was it merely that something had been burned out, destroyed, when he watched Kaelor destroy himself! Surely the last of the old Davlo had died with Kaelor? Had anything, anyone, taken the old Davlo’s place, or was he just an empty shell of a man, going through the motions?
No. Never mind. Think about other things. Think about the plan to move the comet.
Davlo’s initial plan had been to use a fairly standard high-yield nuclear bomb, but the Settler-designed detonation thrusters were a vast improvement on that idea. In essence, a d-thruster was a nuclear bomb set off inside a powerful force field formed in the shape of a huge rocket nozzle. The force field directed the force of the explosion into the proper direction, in effect producing a shaped charge that was far more efficient and far more controllable.
Other explosive charges were being rigged as well, of course. Once the comet had been redirected into its intercept course with Inferno, it would still be quite some distance away from the planet. It would take it just over thirty-two days to move from the point in space where the initial course change was made to its intercept with Inferno.
Just before arrival at the planet, the comet would be broken up into smaller pieces by explosive cutting charges, each piece to be directed toward a different point on the surface. Each fragment would have its own smaller, non-nuclear propulsion system and attitude control system.
And that was the part that worried Davlo. That was the greatest danger in the plan. In theory, at least, it might be possible for human operators and standard computer systems to manage the complexities of the operation. But the current plan called for Grieg to be broken up into twelve fragments, and it was far from certain that all the cutting charges would shear the massive body into pieces of precisely the intended size. Besides which, there were bound to be thousands of smaller fragments produced by the blasts of the cutting charges. Most would be too small to do any damage.
But all it would take was a fragment smashing into a thruster at the wrong moment, or for a fragment to end up being larger or smaller than expected, and then the whole careful sequence of events could go out of control. There were enough spare thrusters to serve as backups, so that if some of the thrusters on a given fragment were destroyed, the rest would be able to do the job. Indeed, there were no ifs in the question. Some part of the established plan was going to go wrong-it was just that no one could be sure which part. It would require immediate, real-time management of the operation to deal with the inevitable problems.
Managing the terminal phase of the operation would mean dealing with thousands of operations simultaneously. It would require juggling the twelve fragments at once, keeping them out of each other’s way while guiding them down to their intended impact sites, while dealing with the cloud of debris produced by the cutting charges.
No matter what theory said, in practice, the job was beyond humans, beyond any combination of human and computers. The only entity able to deal with it all would have to have the decision-making ability of a human combined with the computational speed and accuracy of a computer-in short, a robot.
Nor would just any robot do. The task was too complex for any standard robot to contend with. Even just handling the hundreds of sensory input channels would overwhelm a normal positronic brain.
The one, the only, possible way to control the terminal phase was to hand the job over to Units Dee and Dum.
And that, of course, meant putting a Three-Law robot, and her computerized counterpart, in charge.
And if Kaelor had killed himself rather than cooperate with the comet intercept, how the devil was Dee actually going to run the operation without losing her mind—or point-blank refusing to do the job?
THE SAME SORT of question was very much on Alvar Kresh’s mind as he and Fredda settled into their aircar for the brief flight from the Winter Residence to the Terraforming Center. Their days had settled into a routine with startling speed. Get up, go to the center, spend the day sorting out the details of the planet’s fate, then go home to the Residence for dinner and a good night’s sleep, or at least an attempt at sleep, before getting up to do it all again the next day.
Somehow, he hadn’t expected there to be so many decisions for him to make, so much hands-on work for him to do. For all the power and capacity and sophistication of the Terraforming Center and the twin Control Units, there were some decisions that no robot or other human could make, disputes that only the governor had the authority to settle. And besides, there were a lot of humans out there who were not going to take orders, however sensible, from a robot. And there were things that Kresh knew that Dee and Dum did not—how best to handle this local leader, which prices for emergency supplies he could expect to bargain down and which he could not, where he could ask a favor, where he could call one in, how far people could be pushed if need be, and when to give up.
But everything was routed through the Terraforming Center. It had soon become clear to Kresh that he would have had to relocate his command operations at the Center if it hadn’t started there to begin with.
Fredda followed him into the aircar and sat down in the seat next to him. Donald took his place at the controls, did a safety check, lifted off, and headed for the center.
So far, the preparations for the comet diversion were going quite well. But he could not stop worrying. It was never far from his mind that Dee believed all Inferno to be a simulation. Whether or that was likely to be help or hindrance he still could not decide. “So what do you think?” he asked his wife.
Fredda looked at him with an amused smile. “About what? It’s a little hard to offer my opinion unless I get a few more clues than that.”
“Sorry. I’m a little preoccupied. Do you think Dee and Dum are going to be able to control this operation?”
“I don’t know,” said Fredda. “I spend every day monitoring Dee, watching her behavior, trying to understand her. But there’s a very basic barrier I can’t get around. She doesn’t think any of this is real. I can understand the logic behind telling her the world is imaginary, but I must admit I question the wisdom of the decision. So much depends on her getting things exactly right—and yet, to her, it is all a game. She’s so casual about it all, as if the whole s
ituation had been set up solely for her amusement.”
“From her point of view, it was all set up for her amusement,” said Kresh. “As far as she is concerned, the world of Inferno is just a puzzle for her to solve—or declare insoluble.” He was silent for a moment before he spoke again. “I’d have to agree with you about her attitude,” he said, “but at the same time, I’d have to say the quality of her work has been impeccable. She may not take it seriously, but she does it seriously. Maybe that’s all that counts.”
“I hope so,” said Fredda, “because I don’t know what the devil we do if we decide we don’t trust her. In theory, we could pull the plug and let Unit Dum take up the slack. But I don’t think that’s really possible anymore. The two of them are too interlinked, too interconnected. They rely on each other too much for us to pull one of them abruptly off-line.”
“And Dee is in charge,” Kresh suggested. “It seems to me she just uses Dum as a sort of auxiliary calculating device.”
“No,” said Fredda, quite sharply. “That assumption is an easy trap to fall into. She does run the show when it comes to human interaction—that much is obvious. But that is the smallest fraction of their work. In everything else, they are coequal. There are some areas where Dum very definitely takes the lead—such as computational speed. Yes, he’s just a dumb machine, a mindless computer system with a crude personality simulator to serve as an interface. But he’s carrying a lot of the load. We not only need both of them—we can’t have one without the other.”
“There are times,” said Kresh, “when I could do without either of them, or any of this.”
Neither of them spoke as Donald brought the aircar into a smooth landing in front of the Terraforming Center.
KRESH, FREDDA, AND Donald walked into Room 103 at the Terraforming Center and took their accustomed places at the console nearest to Dee. Their division of labor was straightforward. Kresh worked through the endless sequence of decisions large and small presented to him by Unit Dee.
