But they had no public baths. He ran around in circles on the dance floor, making his running a kind of dance, and later he returned to the same mound, and a group of the locals gathered around him and Coyote. “Like being the father of the Dalai Lama, eh? Don’t you get a name for that?”

“To hell with you, man! Like I was saying, Ann says they stopped digging these seventy-five-degree moholes because the lithosphere is thinner down here.” Coyote nodded portentously. “I want to go to one of the decommissioned moholes and start up its robots again, and see if they dig down far enough to start a volcano.”

Everyone laughed. But one woman shook her head. “If you do that they’ll come down here to check it out. If you’re going to do it, you should go north and hit one of the sixty-degree moholes. They’re decommissioned too.”

“But the lithosphere up there is thicker, Ann says.”

“Sure, but the moholes are deeper too.”

“Hmm,” Coyote said.

And the conversation moved on to more serious matters, mostly the inevitable topics of shortages, and developments in the north. But at the end of that week, when they left Vishniac, by way of a different and longer tunnel, they headed north, and all Coyote’s previous plans had been thrown out the window. “That’s the story of my life, boy.”

On the fifth night of driving over the jumbled highlands of the south, Coyote slowed the rover, and circled the edge of a big old crater, subdued almost to the level of the surrounding plain. From a defile in the ancient rim one could see that the sandy crater floor was marred by a giant round black hole. This, apparently, was what a mohole looked like from the surface. A plume of thin frost stood in the air a few hundred meters over the hole, appearing from nothing like a magician’s trick. The edge of the mohole was beveled so that there was a band of concrete funneling down at about a forty-five-degree angle; it was hard to say how big this coping band was, because the mohole made it seem like no more than a strip. There was a high wire fence at its outer edge. “Hmm,” Coyote said, staring out the windshield. He backed up in the defile and parked, then slipped into a walker. “Back soon,” he said, and hopped into the lock.

It was a long, anxious night for Nirgal. He barely slept, and was in an intensifying agony of worry the next morning when he saw Coyote appear outside the boulder car lock, just before seven A.M. when the sun was about to rise. He was ready to complain about the length of this disappearance, but when Coyote got inside and got his helmet off it was obvious he was in a foul temper. While they sat out the day he tapped away at his AI in an absorbed conference , cursing vilely, oblivious to his hungry young charge. Nirgal went ahead and heated meals for them both, and then napped uneasily, and woke when the rover jerked forward. “I’m going to try going in through the gate,” Coyote said. “That’s quite the security they have on that hole. One more night should see it either way.” He circled the crater and parked on the far rim, and at dusk once again left on foot.

Again he was gone all night, and again Nirgal found it very difficult to sleep. He wondered what he was supposed to do if Coyote didn’t return.

And indeed he was not back by dawn. The day that followed was the longest of Nirgal’s life without a question, and at the end of it he had no idea what he was going to do. Try to rescue Coyote; try to drive back to Zygote, or Vishniac; go down to the mohole, and give himself up to whatever mysterious security system had eaten up Coyote: all seemed impossible.

But an hour after sunset Coyote tapped the car with his tik-tik-tik, and then he was inside, his face a furious mask. He drank a liter of water and then most of another, and blew out his lips in disgust. “Let us get the fuck out of here,” he said.

After a couple of hours of silent driving Nirgal thought to change the subject, or at least enlarge it, and he said, “Coyote, how long do you think we will have to stay hidden?”

“Don’t call me Coyote! I’m not Coyote. Coyote is out there in the back of the hills, breathing the air already and doing what he wants, the bastard. Me my name is Desmond, you call me Desmond, understand?”

“Okay,” Nirgal said, afraid.

“As for how long we will have to stay hiding, I think it will be forever.”

They drove back south to Rayleigh mohole, where Coyote (he didn’t seem to be a Desmond) had thought to go in the first place. This mohole was truly abandoned, an unlit hole in the highlands, its thermal plume standing over it like the ghost of a monument. They could drive right into the empty sand-covered parking lot and garage at its rim, between a small fleet of robot vehicles shrouded by tarpaulins and sand drifts. “This is more like it,” Coyote muttered. “Here, we’ve got to take a look down inside it. Come on, get into your walker.”

It was strange to be out in the wind, standing on the rim of such an enormous gap in things. They looked over a chest-high wall and saw the beveled concrete band that rimmed the hole, dropping at an angle for about two hundred meters. In order to see down the shaft proper, they had to walk about a kilometer down a curving road cut into the concrete band. There they could stop at last, and look over the road’s edge, down into blackness. Coyote stood right on the edge, which made Nirgal nervous. He got on his hands and knees to look over. No sign of a bottom; they might as well have been looking into the center of the planet. “Twenty kilometers,” Coyote said over the intercom. He held a hand out over the edge, and Nirgal did too. He could.feel the updraft. “Okay, let’s see if we can get the robots going.” And they hiked back up the road.

Coyote had spent many of their daytime hours studying old programs on his AI, and now, with the hydrogen peroxide from their trailer pumped into two of the robot behemoths in the parking lot, he plugged into their control panels and went at it. When he was done he was satisfied they would perform as required at the bottom of the mohole, and they watched the two, with wheels four times as tall as Coyote’s car, roll off down the curving road.

“All right,” Coyote said, cheering up again. “They’ll use their solar-panel power to process their own peroxide explosives, and their own fuel as well, and go at it slow and steady until maybe they hit something hot. We just may have started a volcano!”

“Is that good?”

Coyote laughed wildly. “I don’t know! But no one’s ever done it before, so it has that at least to recommend it.”

They returned to their scheduled travel, among sanctuaries both hidden and open, and Coyote went around saying, “We started up Rayleigh mohole last week, have you seen a volcano yet?”

No one had seen it. Rayleigh seemed to be behaving much as before, its thermal plume undisturbed. “Well, maybe it didn’t work,” Coyote would say. “Maybe it will take some time. On the other hand if that mohole was now floored with molten lava, how would you be able to tell?”

“We could tell,” people said. And some added: “Why would you do something as stupid as that? You might as well call up the Transitional Authority and tell them to come down here to look for us.”

So Coyote stopped bringing it up. They rolled on from sanctuary to sanctuary: Mauss Hyde, Gramsci, Overhangs, Christianopolis… At each stop Nirgal was made welcome, and often people knew of him in advance, by reputation. Nirgal was very surprised by the variety and number of sanctuaries, forming together their strange world, half secret and half exposed. And if this world was only a small part of Martian civilization as a whole, what must the surface cities of the north be like? It was beyond his grasp — although it did seem to him that as the marvels of the journey continued, one after the next, his grasp was getting a bit larger. You couldn’t just explode from amazement, after all.