Science Fiction: The Best of the Year, 2008 Edition

by Rich Horton

  “Baggins, follow, absolute.” Now his porter would try to stay within two meters of his transponder, catching up when it fell behind, until it ran out of power or was destroyed. If he lost it, he might have to walk hungry for a while, but the northern stations were only a couple of days to reach. His Mars suit batteries were good for a week or more; the suit extracted water and air; he just had to hope he wouldn't need the first aid kit, but it was too heavy to strap onto the suit.

  The great blue-white welding-arc pillar had cooled to orange-white, and the main body of Boreas, rising right on schedule, stood behind it as a reflector. The light at Thorby's back was brighter than noonday equatorial sun on Earth, much brighter than any sun Mars had ever seen, and the blazing face of Boreas, a quarter of the sky, spread the light with eerie evenness, as if the whole world were under too-bright fluorescent light.

  He hurled himself along the windward side of the south-tending dune crest, using the skating technique he'd learned on Earth snow and practiced on frozen methane beds on Triton; his pushing ski flew out behind him, turning behind the lead ski to give extra push, then reach as far in front of him as possible, kicking and reaching as far as he could. On the slick, small-round-particle sand of the ridge top, in the low gravity, he might have been averaging as much as twenty kilometers per hour.

  But the blast front from the impact was coming at them at the local speed of sound, 755 kilometers per hour, and though that was only 2/3 as fast as Mach 1 in warm, thick, breathable air, it was more than fast enough to overtake them in a half hour or less. At best the impact might have been four hundred kilometers away, but it was almost surely closer.

  He glanced back. Léoa skied swiftly after him, perhaps even gaining ground. The light of the blazing pillar was dimmer, turning orange, and his long shadow, racing in front of him, was mostly cast by the dirt-filtered light of the Boreas-dawn. He wasn't sure whether Boreas would stay in the sky till the sun came up, but by then it would all be decided anyway.

  “Thorby.”

  “Yeah.”

  “I've had it look for shelter, read me some directions, and project a sim so I'm sure, and there's a spot that's probably safe close to here. This dune crest will fork in about a kilometer. Take the left fork, two more kilometers, and we'll be behind a crater wall from the blast.”

  “Good thinking, thanks.” He pushed harder, clicking his tongue control for an oxy boost. His Mars suit increased the pressure and switched to pure oxygen; his pace was far above sustainable, but either he made this next three kilometers or he didn't.

  Léoa had destroyed his recording setup. He'd known she deplored his entire career of recording BEREs—Big Energy Release Events—at least as much as she disliked the whole idea of the Great Blooming, but he'd had no idea she would actually hash the joint project just to stop him from doing it. So his judgment about people was even worse than he'd thought it was. They had been colleagues and (he'd thought) friendly rivals for decades, and he hadn't seen it coming.

  He kept pushing hard, remembering that he was pouring so much oxygen into his bloodstream that he had to keep his muscles working hard, or hyperventilate. His skis flew around him, reached out to the front, whipped back, turned, lifted, flew out around him, and he concentrated on picking his path in the shifting light and staying comfortably level and in control; in the low Martian gravity, with the close horizon that didn't reveal parallax motion very well to eyes evolved for Earth, it was far too easy to start to bounce; your hips and knees could easily eat a third of your energy in useless vertical motion.

  The leeward side of a dune crest is the one that avalanches, so he stayed to the right, windward side, but he couldn't afford to miss the saddle-and-fork when it came, so he had to keep his head above the crest. He heard only the hiss of his breath and the squeal of his skis on the sand; the boiling column from the impact, now a dull angry red, and the quarter-of-the-sky circle of the comet now almost directly overhead were eerie in their silence. He kept his gaze level and straight out to the horizon, let his legs and gut swing him forward, kept the swinging as vertical as he could, turning only the ski, never the hip, hoping this was right and he was remembering how to do it, unable to know if he was moving fast enough through the apparently endless erg.

  He had just found the fork and made the left turn, glancing back to check on Léoa. She seemed to be struggling and falling a little behind, so he slowed, wondering if it would be all right to tell her she was bouncing and burning unnecessary energy.

  The whole top five meters of the dune crest under her slid down to the leeward in one vast avalanche. For one instant he thought, but how can that be, I just skied it myself and I'm heavier. The ground fell away beneath him in shattering thunder as the whole dune slumped leeward.

  Of course, how did I miss that? In the Martian atmosphere, a cold thin scatter of heavy CO2 molecules, sound is much slower than it is in anything human beings can breathe; anyone learns that after the first few times a hiking buddy's radio has exmike sound in the background, and it seems to be forever before your own exmike picks it up. But the basalts of the old Martian sea floor are solid, dense, cold, and rigid to a great depth; seismic waves are faster than they are elsewhere.

  He thought that as he flipped over once, as if he were working up the voiceover for his last docu. Definitely for his last docu.

  In the low gravity, it was a long way to the bottom of the dune. Sand poured and rumbled all around him, and his exmike choked back the terrible din of thousands of dunes, as the booming erg was all shaken at once by the S-waves running through the rock below it, setting up countless resonances, triggering more avalanches and more resonances, until nearly the whole potential energy of the Sand Sea released at once.

  Maybe just to annoy Léoa, he intoned a voiceover, deliberately his corniest ever, as he tumbled down the slope and wondered how the sand would kill him. “It is as if the vast erg knows what Boreas is, that this great light in the sky is the angel of death for the Sand Sea, which shouts its blind black stony defiance to the indifferent glaring ice overhead.”

  He rolled again, cutting off his intoning with an oof! and released his skis. Rolling again, he plowed deep into the speeding current of sand. Something hard hit the back of his helmet. He tumbled faster and faster, then flopped and slid on his belly headfirst.

  In darkness, he heard only the grinding of fine sand against his exmike.

  * * * *

  The damp in Thorby's undersuit and his muzzy head told him he'd just done the most embarrassing thing of his life, fainted from fear. Now it felt like his worst hangover; he took a sip of water. Bruised all over, but no acute pain anywhere; slipped out of his urine tube, that seemed to be all that was wrong. If Baggins caught up with him, Thorby would like to get into the shelter, readjust things in the undersuit, sponge off a bit, but he didn't absolutely have to.

  His clock didn't seem to be working—it didn't keep its own time, just reported overhead signal—but the wetness in his undersuit meant he couldn't have been out more than fifteen minutes or so. He'd be dry in another few minutes as the Mars suit system found the moisture and recycled it.

  He was lying on his face, head slightly downward. He tried to push up and discovered he couldn't move his arms, though he could wriggle his fingers a bit, and after doing that for a while, he began to turn his wrists, scooping more sand away, getting leverage to push up more. An eternity later he was moving his forearms, and then his shoulders, half shaking the sand off, half swimming to the top. At last he got some leverage and movement in his hips and thighs, and heaved himself up to the surface, sitting upright in the silvery light of the darkened sky.

  There was a pittering noise he couldn't quite place, until he realized it was sand and grit falling like light sleet around him. The blast wave that had carried it must have passed over while Thorby was unconscious; the tops of the dunes had an odd curl to them, and he realized that the top few meters had been rotated ninety degrees from their usual west-windw
ard, east-leeward, to north-windward, south-leeward, and all the dunes were much lower and broader. Probably being down in the bowl had saved his life; maybe it had saved Léoa too.

  He clicked over to direct voice. “Léoa?”

  No answer, and her voice channel hadn't sent an acknowledge, so she wasn't anywhere in radio range, or she was buried too deep for him to reach her.

  He tried the distress channel and got a message saying that if he was above thirty degrees north latitude and wasn't bleeding to death within ten kilometers of a hospital, he was on his own. Navigation channel was out as well, but if he had to he could just walk with the Bears and Cassiopeia to his back while they got the navigation system back on, and still get himself to somewhere much safer and closer to other people, though getting out of the dunes might take a week without his skis.

  When the crest had avalanched under Léoa she'd been at least 150 meters behind him, and he wasn't sure she'd gone down into this bowl. He tried her on direct voice again, and still had nothing, so he tried phone and was informed that overhead satellite service was temporarily suspended. He guessed that the impact had thrown enough junk around to take down some of the high-ellipse polar satellites that supplied communication and navigation.

  If he knew he was alone, the thing to do would be to start walking south, but he couldn't leave Léoa here if there was any chance of finding her. The first aid kit in Baggins had directional gear for checking her transponder, but Baggins was probably buried or crushed, and even if the porter was still rolling it might be a while before it found its way to him.

  He would wait a few hours for Baggins anyway; the porter not only had the food, but could also track the tags on his skis and poles, and had a power shovel. A lot better to begin with a shelter, food, and skis than to get one or two kilometers further and a lot more tired. And he did owe Léoa a search.

  The best thing he could think of to do—which was probably useless—was to climb to the top of the slope he'd rolled down. The pre-dawn west wind was rising, and the sand swirled around his boots; it was hard going all the way up, and it was dawn before he reached the top. The small bloody red sun rising far to the southeast, barely penetrating the dense dust clouds, gave little light. He clicked his visor for magnification and light amplification, and turned around slowly, making himself look at each slope and into each bowl he could see into, since with the wind already erasing his boot prints, he knew that once he walked any distance he'd have little chance of finding even the bowl into which he'd fallen.

  There was something small and dark moving and slipping down the side of the next bowl north; he took a few steps, and used the distance gauge. It estimated the object to be about a meter across and two kilometers away.

  He moved toward it slowly until he realized it was Léoa's porter, headed roughly for the bottom of the bowl, so it must be getting signal from her transponder. He descended to meet it and found it patiently digging with its small scoop and plow, rocking back and forth on its outsize dune wheels to get more leverage.

  Thorby helped as much as he could—which wasn't much—with his hands. He didn't know whether the porter would try to dig her out if the med transponder showed she was dead, and of course it would ignore him, so he didn't have any way to ask it about anything. The suits usually ran with a couple of hours of stored air as a buffer, and made fresh air continually, but if she'd switched to pure direct oxygen as he had, there might not have been much in her tank, and if the intake was buried and filled with sand, she could suffocate.

  Presently he felt a hard object; an instant later the porter reached forward with a claw, took a grip, and pulled one of Léoa's skis from the sand, putting it into its storage compartment, before rolling forward. Thorby stared at it for a long moment, and started to laugh as he followed the porter up the hill, to where it plucked out a pole. Presumably it would get around to Léoa, sooner or later; nobody had thought to make life-saving a priority for a baggage cart.

  The roiling sky was the color of an old bruise and his temperature gauge showed that it was cold enough for CO2 snow to fall. He followed Léoa's porter and tried the phone again. This time he got her voicemail, and left a message telling her what was going on, just in case she was wandering around on a hill nearby and out of line of sight from the satellite.

  Five minutes later his phone rang. “Thorby?”

  “Yeah, Léoa, are you okay?”

  “No. Buried to my mid chest, I think I have a broken back and something's really wrong with my leg, and I can see your porter from where I am but I can't get its attention.” Her voice was tense with pain. “Can't tell you where I am, either. And you wouldn't believe what your porter just did.”

  “It dug up one of my skis. That's what yours is doing over here. All right, to be able to see it you must be in the same bowl I landed in, one to the south, I'm on my way. I'm climbing without skis, so I'm afraid this is going to be slow.”

  After a while as he climbed, the wind picked up. “Léoa?” he called, on the phone again because radio still wasn't connecting them.

  “I'm here. Your porter found your other ski. Do you think it will be okay for me to have some water? I've been afraid to drink.”

  “I think that's okay, but first aid class was a while ago. I was calling because I was afraid sand might be piling up on you.”

  “Well, it is. I'm trying to clear it with my arms but it's not easy, and I can't sit up.”

  “I don't think you should try to sit up.”

  They talked while he climbed; it was less lonely. “Your porter is digging about three hundred meters behind me,” he told her. “It must be finding your other ski.”

  “Can't be, if it's already found one, because the other one is bent under me.”

  “Well, it's getting your pole then. If your ski is jammed under you, it sounds like it hurts.”

  “Oh yeah, the release must have jammed and it twisted my leg around pretty badly, and walloped me in the spine. So the porter must be finding my pole. Or maybe I dropped a ration pack or something. They've got so much spare processing power, why didn't anyone tell them people first, then gear?”

  “Because there probably aren't a hundred million people, out of sixteen billion, that ever go off pavement, or to any planet they weren't born on,” he said. “The porters are doing what they'd do in a train station—making sure our stuff is all together and not stolen, then catching up with us.”

  “Yours just found a pole and it's heading up the hill, so I guess it's on its way to you now.”

  He topped the rise a few minutes later, just as Baggins rolled up to him and waited obediently for orders. “Skis and poles,” he said to his loyal idiot friend, and the machine laid them out for him.

  He couldn't see Léoa, still, but there was so much sand blowing around on the surface that this might not mean anything. He tried direct voice. “Léoa, wave or something if you can.”

  An arm flopped upward from a stream of red dust halfway down the slope before him, and he glided down to her carefully, swinging far out around her to approach from below, making sure he didn't bump her or push sand onto her. He had to wait for Baggins to bring all the gear along, and tell it to approach carefully, but while the porter picked its way down the slope, he put the first aid and rescue gear manuals into his audio channel, asked it to script the right things to do, and listened until he could recite it back. This was one of those times that reminded him he'd always wanted to learn to hand-read.

  Meanwhile he kept brushing sand off Léoa; she was crying quietly now, because it still hurt, and she had been afraid she would be buried alive, and now that he was there to keep her intakes clear, she was safe.

  Late that afternoon, he had completed digging her out, tying her to the various supports, putting the drugs into her liquids intakes, and equipping Baggins to carry her. She was lying flat on a cross-shaped support as if she'd been crucified. Voice-commanding Baggins, he slowly raised her, got the porter under her, and balanced her on
top. With Baggins's outrigger wheels extended as far as they would go, she would be stable on slopes less than ten degrees from the horizontal, and at speeds below three kilometers per hour. Thorby figured that hauling her would be something to do for a couple of days until rescue craft were available for less urgent cases.

  Com channels were coming back up gradually, and the navigation channel was open again, but there was still little news, except a brief announcement that the impact had not been an early breakup of the comet, but apparently been caused by an undetected stony satellite of Boreas, about a half kilometer across. Splashback from the impact, as Thorby had guessed, had destroyed most of the satellites passing over the pole in the hours following. The dust storm it had kicked up had been impressive but brief and localized, so that only a half dozen stations and towns in the far north had taken severe damage, and tourist trade was expected to increase as people flocked to see the new crater blasted through the polar ice and into the Martian soil before the Boreal Ocean drowned it.

  Authorities were confirming that the pass over the South Pole in seventeen days, to be followed with an equatorial airbrake nine days after that, was still on schedule. Thorby figured he'd be able to cover those, easily, so Léoa's little political action would mean very little.

  He wanted to ask her about that but he didn't quite see how to do it.

  Shortly after Baggins began to carry the cruciform Léoa in a slow spiral up the inside of the bowl, gaining just a couple of meters on each circuit, her porter appeared over the top of the dune. It had apparently found the last ski pole, or whatever it was digging for, and now followed her transponder like a faithful dog, behind Baggins, around and around the sandy bowl.

  Léoa insisted that he get visual recordings of that silly parade, but he quietly killed the audio on it, because all that was really audible was her hysterical laughter. He attributed that to the painkillers.