Arkady looked at her, finished swallowing. “Good idea,” he said.

But only if they could actually pick up the road’s transponder signals. Arkady flicked on the radio and called Underhill. The connection crackled in a storm of static almost as dense as the dust, but they could still make themselves understood. All through that night they conferred with the crowd back home, discussing frequencies, bandwiths, the power of the dust to mask the transponder’s farily weak signals, and so on. Because the transponders were designed only to signal rovers that were nearby and on the ground, it was going to be a problem hearing them. Underhill might be able to pinpoint their location well enough to tell them when to descend, and their own radar map would give them a general fix on the road’s location as well; but neither of these methods would be very exact, and it would be almost impossible to find the road in the storm if they didn’t land right on it. Ten kilometers either way and it would be over the horizon, and they would be out of luck. It would be a lot more certain if they could just latch onto one of the transponder signals, and follow it down.

In any case, Underhill dispatched a robot rover on the road north. It would arrive in the area of the road they were expected to cross in about five days; at their current speed, now nearly thirty kilometers per hour, they would cross the road themselves in about four days.

When the arrangements were finished, they traded watches through the rest of the night. Nadia slept uneasily on her off watches, and spent much of the time lying on the bed feeling the wind bounce her. The windows were as dark as if curtains had been drawn. The roar of the wind was like a gas stove, and then occasionally like banshees; once she dreamed they were inside a great furnace full of flame demons, and woke sweating, and went forward to relieve Arkady. The whole gondola smelled of sweat and dust, and burnt hydrazine. Despite all the gaskets’ micron seals, there was a visible whitish film on all the surfaces inside the gondola. She wiped her fingers across a pale blue plastic bulkhead, and stared at her fingers’ mark. Incredible.

They bounded along through the gloom of the days, through the starless black of the nights. The radar showed what they thought was Fesenkov Crater, running under them; they were being shoved northeast still, and there was absolutely no chance they would be able to buck the storm and get south to Underhill. The polar road was their only hope. Nadia occupied her off watches by looking for things to throw overboard, and cutting away at parts of the gondola frame she judged inessential, until the engineers in Friedrichshafen would have shuddered. But Germans always overengineered things, and no one on Earth could ever really believe in martian gee anyway. So she sawed and hammered until everything inside the gondola was latticed nearly to nothing. Every use of the bay brought in another small cloud of dust, but she figured it was worth it; they needed the loft, her windmill arrangement was not getting sufficient power to the batteries, and she had tossed the rest of them overboard long before. Even if she had had them, she would not have gone back under the dirigible to install them; the memory of the incident still gave her the shivers. Instead she kept cutting further and further; she would have tossed out pieces of the dirigible frame too, if she could have gotten into the ballonets.

While she did this Arkady padded around the gondola cheering her on, naked and dust-caked, the red man incarnate, singing songs and watching the radar screen, jamming down quick meals, planning their course such as it was. It was impossible not to catch a bit of his exhilaration, to marvel with him at the strongest buffets of the wind, to feel the dust flying wild in her blood.

And so three long intense days passed, in the wild grip of the dark orange wind. And on the fourth day, a bit after noon, they turned the radio receiver up to full volume, and listened to the crackly roar of static at the transponders’ frequency. Concentrating on the white noise made Nadia drowsy, for they had had very little sleep; and she was almost unconscious when Arkady said something, and she jerked up in her seat.

“Hear it?” he asked again. She listened, and shook her head. “There, it’s a kind of ping.”

She heard a little bip. “Is that it?”

“I think so. I’m going to get us down as fast as I can, I’ll have to empty some of the ballonets.”

He tapped away at the control keyboard, and the dirigible tilted forward and they began to drop at emergency speed. The altimeter’s numbers flickered down. The radar screen showed the ground below to be basically flat. The ping got louder and louder; without a directional receiver, that was going to be their only way to tell if they were still approaching it or moving away. Ping… ping… ping… In her exhaustion it was hard to tell what whether it was getting louder or softer, and it seemed every beep was a different volume, depending on the attention she could bring to bear.

“It’s getting softer,” Arkady said suddenly. “Don’t you think?”

“I can’t tell.”

“It is.” He switched on the props, and with the whir of the motors the signal definitely seemed quieter. He turned into the wind, and the dirigible bounced wildly; he fought to steady its downward movement, but there was a delay between every shift of the flaps and the dirigible’s bucking, and in reality they were in little more than a controlled crash. The ping was perhaps getting softer at a slower rate.

When the altimeter indicated they were low enough to drop the anchor they did so, and after an anxious bit of drifting it caught, and held. They dropped all the anchors they had, and pulled the Arrowhead down on the lines. Then Nadia suited up and climbed into the sling and winched down, and once on the surface she began walking around in a chocolate dawn, leaning hard into the irregular torrent of wind. She found she was more physically exhausted than she could ever remember being, it was really hard to make headway upwind, she had to tack. Over her intercom the transponder signal pinged, and the ground seemed to bounce under her feet; it was hard to keep her balance. The ping was quite distinct. “We should have been listening on our helmet intercoms all along,” she said to Arkady. “You can hear better.”

A gust knocked her over. She got up and shuffled slowly along, letting out a nylon line behind her, adjusting her course as she followed the volume of the pings. The ground flowed underfoot, when she could see it; visibility was actually down to a meter or less, at least in the thickest gusts. Then it would clear a touch and brown jets of dust would flash by, sheet after sheet, moving at an awesome speed. The wind buffetted her as hard as anything she had ever felt on Earth, or harder; it was painful work to keep her balance, a constant physical effort.

While inside a thick, blinding cloud, she nearly shuffled right into one of the transponders, standing there like a fat fencepost. “Hey!” she shouted.

“What’s wrong?”

“Nothing! I scared myself running into the roadmark.”

“You found it!”

“Yeah.” She felt her exhaustion run down into her hands and feet. She sat on the ground for a minute, then stood again; it was too cold to sit. Her ghost finger hurt.

She took up the nylon line, and returned blindly to the dirigible, feeling she had wandered into the ancient myth, and was following the only thread out of the labyrinth.

During their rover trip south, blind in the flying dust, word came crackling over the radio that UNOMA had just approved and funded the establishment of three follow-up colonies. Each would consist of five hundred people, all to be from countries not represented in the first hundred.