"Good job," the Relay trace web whispered. North was pleased. "The fission mines were perfectly placed. Nothing remains."

"No," Rogers agreed. "Nothing remains."

Corporal Pete Matson pushed the front door open, grinning from ear to ear. "Hi, honey! Surprise!"

"Pete!" Gloria Matson came running, throwing her arms around her husband. "What are you doing home? Pete -"

"Special leave. Forty-eight hours." Pete tossed down his suitcase triumphantly. "Hi there, kid."

His son greeted him shyly. "Hello."

Pete squatted down and opened his suitcase. "How have things been going? How's school?"

"He's had another cold," Gloria said. "He's almost over it. But what happened? Why did they -"

"Military secret." Pete fumbled in his suitcase. "Here." He held something out to his son. "I brought you something. A souvenir."

He handed his son a handmade wooden drinking cup. The boy took it shyly and turned it around, curious and puzzled. "What's a – a souvenir?"

Matson struggled to express the difficult concept. "Well, it's something that reminds you of a different place. Something you don't have, where you are. You know." Matson tapped the cup. "That's to drink out of. It's sure not like our plastic cups, is it?"

"No," the child said.

"Look at this, Gloria." Pete shook out a great folded cloth from his suitcase, printed with multi-colored designs. "Picked this up cheap. You can make a shirt out of it. What do you say? Ever seen anything like it?"

"No," Gloria said, awed. "I haven't." She took the cloth and fingered it reverently.

Pete Matson beamed, as his wife and child stood clutching the souvenirs he had brought them, reminders of his excursion to distant places. Foreign lands.

"Gee," his son whispered, turning the cup around and around. A strange light glowed in his eyes. Thanks a lot, Dad. For the -- souvenir."

The strange light grew.

Survey Team

Halloway came up through six miles of ash to see how the rocket looked in landing. He emerged from the lead-shielded bore and joined Young, crouching down with a small knot of surface troops.

The surface of the planet was dark and silent. The air stung his nose. It smelled foul. Halloway shivered uneasily. "Where the hell are we?"

A soldier pointed into the blackness. "The mountains are over there. See them? The Rockies, and this is Colorado."

Colorado… The old name awakened vague emotion in Halloway. He fingered his blast rifle. "When will it get here?" he asked. Far off, against the horizon, he could see the Enemy's green and yellow signal flares. And an occasional flash of fission white.

"Any time now. It's mechanically controlled all the way, piloted by robot. When it comes it really comes."

An Enemy mine burst a few dozen miles away. For a brief instant the landscape was outlined in jagged lightning. Halloway and the troops dropped to the ground automatically. He caught the dead burned smell of the surface of Earth as it was now, thirty years after the war began.

It was a lot different from the way he remembered it when he was a kid in California. He could remember the valley country, grape orchards and walnuts and lemons. Smudge pots under the orange trees. Green mountains and sky the color of a woman's eyes. And the fresh smell of the soil…

That was all gone now. Nothing remained but gray ash pulverized with the white stones of buildings. Once a city had been in this spot. He could see the yawning cavities of cellars, filled now with slag, dried rivers of rust that had once been buildings. Rubble strewn everywhere, aimlessly…

The mine flare faded out and the blackness settled back. They got cautiously to their feet. "Quite a sight," a soldier murmured.

"It was a lot different before," Halloway said.

"Was it? I was born undersurface."

"In those days we grew our food right in the ground, on the surface. In the soil. Not in underground tanks. We -"

Halloway broke off. A great rushing sound filled the air suddenly, cutting off his words. An immense shape roared past them in the blackness, struck someplace close, and shook the earth.

"The rocket!" a soldier shouted. They all began running, Halloway lumbering awkwardly along.

"Good news, I hope," Young said, close by him.

"I hope, too," Halloway gasped. "Mars is our last chance. If this doesn't work we're finished. The report on Venus was negative; nothing there but lava and steam."

Later they examined the rocket from Mars.

"It'll do," Young murmured.

"You're sure?" Director Davidson asked tensely. "Once we get there we can't come running back."

"We're sure." Halloway tossed the spools across the desk to Davidson. "Examine them yourself. The air on Mars will be thin, and dry. The gravity is much weaker than ours. But we'll be able to live there, which is more than you can say for this God-forsaken Earth."

Davidson picked up the spools. The unblinking recessed lights gleamed down on the metal desk, the metal walls and floor of the office. Hidden machinery wheezed in the walls, maintaining the air and temperature. "I'll have to rely on you experts, of course. If some vital factor is not taken into account -"

"Naturally, it's a gamble," Young said. "We can't be sure of all factors at this distance." He tapped the spools. "Mechanical samples and photos. Robots creeping around, doing the best they can. We're lucky to have anything to go on."

"There's no radiation at least," Halloway said. "We can count on that. But Mars will be dry and dusty and cold. It's a long way out."Weak sun. Deserts and wrinkled hills."

"Mars is old," Young agreed.

"It was cooled a long time ago. Look at it this way: We have eight planets, excluding Earth. Pluto to Jupiter is out. No chance of survival there. Mercury is nothing but liquid metal. Venus is still volcano and steam – pre-Cambrian. That's seven of the eight. Mars is the only possibility a priori."

"In other words," Davidson said slowly, "Mars has to be okay because there's nothing else for us to try."

"We could stay here. Live on here in the undersurface systems like gophers."

"We could not last more than another year. You've seen the recent psych graphs."

They had. The tension index was up. Men weren't made to live in metal tunnels, living on tank-grown food, working and sleeping and dying without seeing the sun.

It was the children they were really thinking about. Kids that had never been up to the surface. Wan-faced pseudo mutants with eyes like blind fish. A generation born in the subterranean world. The tension index was up because men were seeing their children alter and meld in with a world of tunnels and slimy darkness and dripping luminous rocks.

"Then it's agreed?" Young said.

Davidson searched the faces of the two technicians. "Maybe we could reclaim the surface, revive Earth again, renew its soil. It hasn't really gone that far, has it?"

"No chance," Young said flatly. "Even if we could work an arrangement with the Enemy there'll be particles in suspension for another fifty years. Earth will be too hot for life the rest of this century. And we can't wait."

"All right," Davidson said. "I'll authorize the survey team. We'll risk that, at least. You want to go? Be the first humans to land on Mars?"

"You bet," Halloway said grimly. "It's in our contract that I go."

The red globe that was Mars grew steadily larger. In the control room Young and van Ecker, the navigator, watched it intently.

"We'll have to bail," van Ecker said. "No chance of landing at this velocity."

Young was nervous. "That's all right for us, but how about the first load of settlers? We can't expect women and children to jump."