He didn't look like it. "An animal? There aren't any animals on Mars!"

"That's what the books say. Me, I'm not so sure. Every now and then you see something moving. Just a flash. Some say they've seen 'em close up, about the size of a squirrel, red brown, blends with the sand."

"I thought animals weren't even possible. No air."

"Yeah." Sarge grinned again. "I'm not sayin' those who've seen 'em close up hadn't had a few. Still in all, it's a big planet and there's a lot about it we don't know."

"That's for sure." And there are plants, I thought. Plants that have the biologists climbing the walls, because they're kin to Earth lichens and can even crossbreed with some Earth strains, but they aren't the same at all. Mars plants cover themselves with a glass bubble like snail shell but more transparent.

"Wonder what'll happen to 'em?" Sarge said.

"To who?"

"To the sand cats. When we get the Project goin', can the goddamn cats live after there's air? But they do say Mars has had air before, so maybe they can. Hope so."

"Tell me about this project. Commander Farr mentioned it, but I haven't heard much from anybody else."

Sarge guided the tractor around a boulder. "The Project's a plan, a way to pump the atmosphere up to maybe a tenth Earth normal, maybe more, enough so we can go outside without p-suits. Warm the planet up. Green things growing, not just in domes, all over."

"Won't that take a long time?"

"Maybe. Not as long as you'd think, the way they tell me. Only we can't get started. Earth bastards won't let us."

We went over a ramp. This road had been used before, if you could call it a road. The only way I knew was here and there boulders had been blasted apart, or there were ramps over some of them. We topped a ramp and I got a good view of the plain and the blowing dust.

"One of these days we'll do it ourselves," Sarge said. "Only it takes things we don't have. Like atom bombs."

I shuddered. Like everyone else on Earth I had been brought up to think of atom bombs as something to kill worlds with. I said that.

"Just tools, Garrett. Just tools. We need the bombs to trigger volcanoes. There's a lot more air and water inside this planet if we can get them out. Then it'll come alive."

We topped another ramp and Sarge stopped the tractor. Without the whine of the electric motors it seemed very quiet, but then I heard the wind, howling ceaselessly, and the crackle as it blew sand against the tractor.

There was nothing out there but dust and the distant mountains. It didn't look as if it had ever been alive, or ever would be. Nothing moved but dust forming into little twisters that Sarge called dust devils.

We were utterly alone. If we got into trouble nobody was around to help us, and we'd have to get out by ourselves or not at all.

Well, I'd wanted to be on my own. I'd got that.

A hundred days went by. There were a lot of times when I wished I hadn't come, and twice I was ready to leave, but talked myself out of it.

We sat in the little bubble-dome at the end of a corridor into Windhome. Sarge called it his veranda. Since the dome was a hundred meters above the floor of Hellas Basin, we had a view that stretched for miles, but there wasn't a lot to see except boulders and dust devils.

Inside the dome we had a jungle of plants, and hard chairs. In Mars' low gravity you don't really need cushions anyway. I hoisted my beer and waved it at Sarge. "You weren't kidding when you said you'd work my arse off!"

Right.

Down below, the agricultural co-op tractor snaked across the basin floor. It pulled six trailers of produce from stations along the Rim. A lot of it was ours.

That had been the first fight I'd had with Sarge: he was desperate to get production higher and higher, make bigger and bigger profits, and I couldn't understand why we couldn't take it easy and relax. There'd be plenty to eat without all that work.

"Sure," he'd said. "But how do I pay the taxes?"

"Taxes?"

"Federation bastards tax hell out of us."

There was another reason he wanted profits, but I didn't find that one out until later.

Now I sat drinking beer. It was slightly sour and I thought I knew a way to improve it. I'd been studying the tapes from the central library, and had the notion that Sarge was using the wrong malting process, one designed for big breweries with better equipment than we had. I'd found a taped copy of an old book, published in 1895, that told how they did it back then and I wanted to try it.

"Drink up," Sarge said. "We got a lot more to do before we turn in."

"Right." I was in no hurry. The work was never finished, but we were caught up for a while. We'd spent the day harvesting corn and wheat from our hydroponics tanks out in the big glass agro-domes. It had been a lot of work. Now it was getting dark out, and we wouldn't be able to work in the domes any more - so we'd do inside maintenance.

There wasn't enough power to do heavy work at night because Windhome ran on solar cells just like the tractor. Closer to Hellastown there were stations drawing power from the nuclear plant, but not out here on the Rim.

I watched the last of the sunlight. There aren't any sunsets on Mars. There's either light or there isn't, for the same reason that shadows are so dark in the daytime: no atmosphere to diffuse the light and make a bright sky like Earth's. On Mars you can be in pitch-black shadow a few feet from bright sunlight.

"You been studying that problem?" Sarge asked.

"Yeah. We can do it. These solar cells are mostly grown crystal, and the circuits to control the growth aren't that tough. Give me the right materials and we'll grow our own."

"Save a lot of money," Sarge said. "Glad you're up on that electronics bit. I never had the time to study it. Doesn't make much sense to me anyway."

I doubted that. I never saw a problem Sarge Wechsung couldn't solve if he had to. Anyway, the library has most of it laid out cookbook style. You just have to be careful to look up all the words, because what an engineer means by a word isn't always the same as what other people mean.

"You said you'll need germanium," Sarge said.

"Right. We don't have any."

"None I've found. Sam Hendrix does though, and he's only about forty kilometers from here."

That made him a near neighbor. Our nearest had a station twelve kilometers away, but I'd never met him except on the phones. I hadn't met Hendrix, either.

"We'll have to run over and buy some," Sarge said. He sat and watched dust devils for a moment. "Sorry you came, kid?"

"No." I was surprised at how easy it was to answer that. It hadn't been the easiest time of my life.

A week before I'd had a blowout. Sarge had given me Number Three ago-dome to plant whatever I wanted. I'd put in tomatoes and squash and nursed them along until they were almost ready to harvest. Then, while I was mixing nutrients for the hydroponic food system, the joint between the glass dome and the bedrock below had gone.

Pressure went to nothing in a couple of seconds. I panicked, but remembered to yell to get the air out of my lungs so I wouldn't explode. Then I got control of myself, looked around for my helmet, found it, and dogged it onto the neck seal of my suit. I closed the face plate and reached down to the air valves, bringing air pressure into my suit. Ten seconds later I was back under pressure. You'd be surprised just how long ten seconds can be.

Then I got the shakes. Sarge had drilled me in blowout practice every day since we came. Anytime he might shout "Blowout!" and if I took more than ten seconds to find my helmet and get it on, he'd make life pure hell. I was damned glad of the practice now.