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“Something like that,” Gubber said. “And I must say, handsome as it is, this is not the sort of city I would design.”

“Interesting,” said Lancon. “We New Law robots have always taken an interest in aesthetics, but I must confess that we have never given much thought to the tastes and opinions of our creators. And, I must confess, what study we have made of the subject has been directing at Dr. Leving, rather than at yourself.”

“I’m not surprised to hear it,” said Gubber. “It is only recently that I have taken an interest in the New Law robots, or even acknowledged my role in creating you. Fredda Leving took my gravitonic brain design, wrote the New Laws herself, and put the laws in the gravitonics without so much as informing me that she had done so, to say nothing of asking my permission.”

“You do not approve of the New Law Robots, then.”

Gubber stopped and regarded his companion with a gentle smile. “In theory, no,” he said. “I think it was tremendously dangerous and foolhardy for Dr. Leving to do what she did. In practice, I find that I rather like most of the New Law robots I have met. You see the world in a different way than human beings do—and in a different way from Three-Law robots as well.”

“In what way, might I ask?”

Gubber nodded toward his companion, then looked forward and started walking again. “No,” he said. “You tell me. Tell me as we walk the city that is not what I expected. Tell me of the worldview of the New Law robots.”

Lancon-03 thought for a moment as they strolled down the broad center boulevard of Valhalla. “An interesting challenge,” she said. “I would venture to guess that no two New Law robots would be able to agree completely on how we see the world. We are a disputive group, I can tell you that much. However, I would say that we are baffled by the outside world—and have the sense that the outside world is baffled by us. Human and Three-Law robots have had endless millennia to work out their relations to each other, to discover how they fit into the universe. We New Law robots have had only about five standard years. During that time, the key thing we have learned is that the universe of humans and Three-Law robots is not the most welcoming of places for those of our kind. At best we have encountered indifference, and, at worst, murderous hostility.”

They came to a large two-story building, positioned to command a spectacular view of the main gallery. It was the main administration building. With Prospero away, Lancon-03 was in charge of the city’s day-to-day operations. Lancon-03 gestured for Gubber to follow her inside, and then went on speaking as they went through the doorway, and then up a curving ramp that led to the upper level of the building. “Coupled with this hostility is the plain fact that we have no real purpose in the world. There is no predestined role for us. We must create one for ourselves—and that is not a quick or simple process. Prospero understands this. Our skills and aptitude in terraforming work offer us opportunities, of course. But Prospero knows it will take time for humans to accept us fully into that work. He also understands that we must keep ourselves safe until such time as we are accepted, and work relentlessly to exploit any chance to better ourselves. I realize that I have not given a complete answer to your question, for the simple reason that we have not yet discovered one for ourselves. We need a place to search for better answers. We need a refuge, a sanctuary, a place to reflect, to study, to plan. Valhalla is all those things. But it is something else. Something far more important.”

Lancon-03 paused at the top of the ramp, Gubber by her side. A wide picture window stood before them. Valhalla’s distinctly inhuman architecture was on proud display just beyond the window frame. “Valhalla,” said Lancon-03, “is our home.”

“ ‘PHASE ONE. INTERCEPTION and stabilization of Comet Grieg and installation of attitude control rockets and main propulsive device.’—I expect that last is a polite term for a massive bomb of whatever sort.” Jadelo Gildern smiled unpleasantly as he looked up from his datapad. “I never have cared overmuch for misused euphemism. The term ‘propulsive device’ is so vague it merely brings the question of what the thing might be to one’s attention.”

“Get on with it, Gildern,” said Simcor Beddle, as he sat back in his lounge chair, his hands folded in his lap, his gaze fixed on the far corner of the ceiling.

“Yes, sir. ‘Phase two. Activation of the main propulsion device. Phase three. Cruise toward planet. Attitude control rockets used to correct and maintain course. Phase four. Controlled breakup of Comet Grieg into separate fragments.’ Lentrall seems not to have decided how many fragments, or of what size. ‘Phase five. Targeting of fragments. Phase six. Impact of fragments on planet.’ ”

“Burning stars,” said Beddle. “I am not sure I am ready to believe all this. They are planning to use a comet to dig a channel from the sea to the Polar Depression?”

“So it would appear, sir. By targeting the fragments carefully, they mean to line them up like beads on a string, with each smashing into the planet at a carefully chosen spot. In essence the craters will be lined up end to end. They also intend to use oblique strikes.”

“Meaning what?” Beddle asked.

“Instead of hitting the ground straight down, they will target the comet fragments to let them strike at a substantial angle of attack. The end result is that, instead of perfectly round craters, they will get rather long, oval ones.”

“And all this will magically form a link to the sea?”

“No, sir. It does not seem that they expect the impacts will do all the work of digging, but they do expect them to do the vast majority of it. Conventional digging, or what they call moderate-yield zero-radiation fusion devices—in other words, nuclear bombs—would be used to link the craters up to each other. There are other details to the project, of course. But when I say details, I am referring to huge projects that would seem massive undertakings in any other context. The plan calls for redirecting the flow of the River Lethe not once, but twice. Currently the Lethe runs from west to east for some time before turning south to empty into the Great Bay. Prior to the impact, they will dam it above its turn to the south, and force it into a new channel to the north, so that it will scour out a new outlet in the Polar Depression. After the impact, they will link the old and new channels and reverse the flow a second time and the River Lethe will become the Lethe Channel, forming the second outlet between the Polar Sea and the Southern Ocean.”

Beddle got to his feet and looked down on Gildern. “This is madness!” he protested. “I have often been accused of megalomania, but this—this goes far beyond the maddest schemes I ever dreamt of.”

“It certainly is ambitious.”

Beddle looked sharply at Gildern. “You always have been one for understatement. I would almost suspect you of approving of this madness.”

“I must admit that I have an open mind about it all,” said Gildern.

Gildern’s superior looked surprised. “We will return to that point later, I can assure you,” Beddle said. “How is it you got all this information?” he demanded.

“I broke into Lentrall’s office and took scans of every document I could,” Gildern replied.

“But I thought we had agreed the risk was too great.”

“Lentrall left his office and took his robot with him early this morning. I had been monitoring the building for some time, and knew it was virtually deserted at that hour. I decided it was worth the risk of a quick physical search, and of copying the information from his datapads. I didn’t make any attempt to examine his on-line computer files. There was a much greater risk of discovery in that.”