Eventually the nausea of the disorientation passed, and in the end he stood and took off in the direction suggested by the wristpad, feeling horrible about it, listing a little uphill just to try to make himself feel better. But one had to trust instruments over instincts, that was science. And so he plodded on, traversing the slope, shading somewhat uphill, clumsier than ever. His nearly insensible feet ran into rocks that he did not see, even though they were directly beneath him; he stumbled time after time. It was surprising how thoroughly snow could obscure the vision.

After a while he stopped, and tried again to locate the rover by APS; and his wristpad map suggested an entirely new direction, behind him and to the left.

It was possible he had walked past the car. Was it? He did not want to walk back into the wind. But now that was the way to the rover, apparently. So he ducked his head down into the biting cold and persevered. His skin was in an odd state, itching under the heating elements crisscrossing his suit, numb everywhere else. His feet were numb. It was hard to walk. There was no feeling in his face; clearly frostbite was in the offing. He needed shelter.

He had a new idea. He called up Aonia, on Pavonis, and got her almost instantly.

“Sax! Where are you?”

“That’s what I’m calling about!” he said. “I’m in a storm on Daedalia! And I can’t find my car! I was wondering if you would look at my APS and my rover’s! And see if you can tell me which direction I should go!”

He put the wristpad right against his ear. “Ka wow, Sax.” It sounded like Aonia was shouting too, bless her. Her voice was an odd addition to the scene. “Just a second, let me check!… Okay! There you are! And your car too! What are you doing so far south? I don’t think anyone can get to you very quickly! Especially if there’s a storm!”

“There is a storm,” Sax said. “That’s why I called.”

“Okay! You’re about three hundred and fifty meters to the west of your car.”

“Directly west?”

“ — and a little south! But how will you orient yourself?”

Sax considered it. Mars’s lack of a magnetic field had never struck him as such a problem before, but there it was. He could assume the wind was directly out of the west, but that was just an assumption. “Can you check the nearest weather stations and tell me what direction the wind is coming from?” he said.

“Sure, but it won’t be much good for local variations! Here, just a second, I’m getting some help here from the others.”

A few long icy moments passed.

“The wind is coming from west northwest, Sax! So you need to walk with the wind at your back and a touch to your left!”

“I know. Be quiet now, until you see what course I’m making, and then correct it.”

He walked again, fortunately almost downwind. After five or six painful minutes his wrist beeped.

Aonia said, “You’re right on course!”

This was encouraging, and he carried on with a bit more speed, though the wind was penetrating through his ribs right to his core.

“Okay, Sax! Sax?”

“Yes!”

“You and your car are right on the same spot!”

But there was no car in view.

His heart thudded in his chest. Visibility was still some twenty meters; but no car. He had to get shelter fast. “Walk in an ever-increasing spiral from where you are,” the little voice on the wrist was suggesting. A good idea in theory, but he couldn’t bear to execute it; he couldn’t face the wind. He stared dully at his black plastic wristpad console. No more help to be had there.

For a moment he could make out snowbanks, off to his left. He shuffled over to investigate, and found that the snow rested in the lee of a shoulder-high escarpment, a feature he did not remember seeing before, but there were some radial breaks in the rock caused by the Tharsis rise, and this must be one of them, protecting a snowbank. Snow was a tremendous insulator. Though it had little intrinsic appeal as shelter. But Sax knew mountaineers often dug into it to survive nights out. It got one out of the wind.

He stepped to the bottom of the snowbank, and kicked it with one numb foot. It felt like kicking rock. Digging a snow cave seemed out of the question. But the effort itself would warm him a bit. And it was less windy at the foot of the bank. So he kicked and kicked, and found that underneath a thick cake of windslab there was the usual powder. A snow cave might be possible after all. He dug away at it.

“Sax, Sax!” cried the voice from his wrist. “What are you doing!”

“Making a snow cave,” he said. “A bivouac.”

“Oh Sax — we’re flying in help! We’ll be able to get in next morning no matter what, so hang on! We’ll keep talking to you!”

“Fine.”

He kicked and dug. On his knees he scooped out hard granular snow, tossing it into the swirling flakes flying over him. It was hard to move, hard to think. He bitterly regretted walking so far from the rover, then getting so absorbed in the landscape around that ice pond. It was a shame to get killed when things were getting so interesting. Free but dead. There was a little hollow in the snow now, through an oblong hole in the windslab. Wearily he sat down and wedged himself back into the space, lying on his side and pushing back with his boots. The snow felt solid against the back of his suit, and warmer than the ferocious wind. He welcomed the shivering in his torso, felt a vague fear when it ceased. Being too cold to shiver was a bad sign.

Very weary, very cold. He looked at his wristpad. It was four P.M. He had been walking in the storm for just over three hours. He would have to survive another fifteen or twenty hours before he could expect to be rescued. Or perhaps in the morning the storm would have abated, and the location of the rover become obvious. One way or another he had to survive the night by huddling in a snow cave. Or else venture out again and find the rover. Surely it couldn’t be far away. But until the wind lessened, he could not bear to be out looking for it.

He had to wait in the snow cave. Theoretically he could survive a night out, though at the moment he was so cold it was hard to believe that. Night temperatures on Mars still plummeted drastically. Perhaps the storm might lessen in the next hour, so that he could find the rover and get to it before dark.

He told Aonia and the others where he was. They sounded very concerned, but there was nothing they could do. He felt irritation at their voices.

It seemed many minutes before he had another thought. When one was chilled, blood flow was greatly reduced to the limbs — perhaps that was true for the cortex as well, the blood going preferentially to the cerebellum where the necessary work would continue right to the end.

More time passed. Near dark, it appeared. Should call out again. He was too cold — something seemed wrong. Advanced age, altitude, CO₂ levels — some factor or combination of factors was making it worse than .it should be. He could die of exposure in a single night. Appeared in fact to be doing just that. Such a storm! Loss of the mirrors, perhaps. Instant ice age. Extinction event.

The wind was making odd noises, like shouts. Powerful gusts no doubt. Like faint shouts, howling “Sax! Sax! Sax!”

Had they flown someone in? He peered out into the dark storm, the snowflakes somehow catching the late light and tearing overhead like dim white static.

Then between his ice-crusted eyelashes he saw a figure emerge out of the darkness. Short, round, helmeted. “Sax!” The sound was distorted, it was coming from a loudspeaker in the figure’s helmet. Those Da Vinci techs were very resourceful people. Sax tried to respond, and found he was too cold to speak. Just moving his boots out of the hole was a stupendous effort. But it appeared to catch this figure’s eye, because it turned and strode purposefully through the wind, moving like a skillful sailor on a bouncing deck, weaving this way and that through the slaps of the gusts. The figure reached him and bent down and grabbed Sax by the wrist, and he saw its face through the faceplate, as clear as through a window. It was Hiroko.