The craters were all filled with ice particles, Sara told them, fine sandlike granules that produced a perfectly level surface, giving no clue how deep they actually were. Most of them had vapor rising from the center in small plumes that drifted almost straight upward, slowly getting wider and thinner as they climbed until, thousands of feet above the plain, they merged into smears of tenuous cirrus that meandered about like spacious contrails. When Ozzie switched to infrared he could see the craters glowing with a weak intensity, no more than a few degrees higher than the surrounding land, but a temperature difference sufficient to cause evaporation. He wondered how much warmer the craters were at the bottom.
Halfway down the slope leading to the plain, he could see the Silfen threading their way past small clumps of crystal trees, lantern lights bobbing about merrily. There was no sign of the riders. One by one, the big sleds crested the top of the slope, and began their precarious descent after the hunters.
It was a rough journey down, with the rucked surface rocking the sleds about. Every so often, the Korrok-hi drivers had to use the ybnan to slow their speed rather than pull them along. Ozzie had a lot of difficulty looking out and checking on Tochee; everyone inside the covered sled was hanging on grimly to the broad bone cage. In the end he just stayed put—there wasn’t much he could do if the tow rope broke anyway. Several pieces of equipment had worked loose to roll around, pans and bone struts jangling as they banged painfully into shins and arms and chests. The brazier was swinging in an alarmingly wide arc on its short chain.
They couldn’t have taken more than forty minutes to reach the plain, although time stretched out to hours inside the cramped stinking cabin. Ozzie had never before appreciated how important it was to be able to see out of a moving vehicle. His imagination filled the whole route down with knife-blade boulders waiting to split them open, and the slope was bound to end with a hundred-yard vertical cliff.
Bill let out a low trumpet of satisfaction to signal the descent was over. Inside the sled, everyone flashed nervous grins around, not willing to admit just how scared they’d been. After that, progress was appreciably easier. Sara was confident they could close some of the distance that had accumulated between them and the Silfen. Orion kept his friendship pendant clasped tightly in his fist, watching its sparkling blue light intently.
The covered sleds maintained a single file, following the fresh tracks in the crunchy grains of snow. They were heading directly away from the massif, rattling along at a good pace. By midday they were skirting along the shoreline ridge of the first crater, with a string of savage rock peaks on the other side. After that there were gullies crowned by curving waves of compacted snow, looking as if the slightest tremble would send them avalanching into the gulf below. Ravines with frozen sheet ice along the floor, where the ybnan had trouble getting a grip with their hooves. Spinneys and forests of crystal trees and bulbous bushes: often when he looked out, Ozzie would see great swaths of them smashed and shattered, leaving jagged stumps surrounded by a pile of ice-encrusted branches. There were narrow, steep saddle valleys to surmount, where their speed was reduced to a painful crawl on the ascent, only to degenerate into a mad slither downward, more abrupt and frightening than the trip down from the massif. Long curves around craters, where the vapor drifted out sideways like a mist, swiftly covering ybnan and sleds alike in a crusty hoarfrost.
When the sun was an hour and a half from the horizon, the massif was invisible behind them, blocked from view by towering spires of sharp black rock. Shadows were lengthening and darkening across the rust-tinted ground. The ybnan teams on all the sleds were beginning to tire, even on the flat their speed was noticeably less than earlier.
“There’ll be no hunt today,” Sara said after she returned from a quick discussion with Bill. “And we need to set up the tents soon. It’s difficult in the dark.”
After another half hour, they emerged from the gap between two rock ridges to look down on a crater measuring over six miles across. Some time after the basin formed, the volcanic activity that riddled the area had thrown up yet another range of fierce crags. This one formed a long promontory extending out almost halfway across the crater.
The Silfen had gathered at the foot of the peak closest to the rim, riders and those on foot bunched together and glowing like a multifaceted jewel in the gathering twilight. A stretch of forest grew up the slope beyond them, its crystal trees taller than those back on the forests of the massif, looking dark and forbidding in the vermilion gloaming.
The sleds pulled up in a broad circle, half a mile from the Silfen, on top of an escarpment that skirted the landward crags. Everyone jumped to, hauling the tents out and slotting the framework together. Once the big tents were up, Ozzie, Orion, and George rigged a smaller frame over Tochee’s sledge, and pulled a big sheet of fur over it. Inside that, they draped another blanket of fur across the top of the sledge’s protective cylinder.
“It should be okay in that,” George said as he crawled out.
Ozzie, who was left inside, grunted agreement. He lit a pair of candles, and put them on the ground in front of the sledge’s windscreen. There wasn’t much space there, probably no more than a couple of cubic yards, but it allowed Tochee to look out, maybe take away any fear of entombment. Looking in through the pane of crystal, Ozzie could see the alien motionless behind it, front eye section aligned on him. He held a mitten out, thumb upward. Tochee’s front eye swirled with ultraviolet patterns, slightly smudged by flaws in the crystal. It translated roughly into: DON’T FORGET ME TOMORROW.
“Not a chance,” Ozzie whispered inside his balaclava.
Tochee pulled the tab on a heatbrick. Ozzie waited until he saw the brick start to glow a deep cherry red, then waved and backed out of the fur coverings.
There was probably another twenty minutes before the sun sank below the horizon. Ozzie hurried off toward the crater rim. It was achingly quiet in the moments just before nightfall. Even the Silfen’s perpetual singing had ended out here under the somber glacial sky. Ahead of him, the surface of the granular ice that filled the crater basin was so flat that the illusion of liquid was almost perfect. As he approached it, he half expected to see ripples. He knelt down beside it, and touched it with his mitten. The surface had the texture of thick oil, though the farther down he pushed his hand, the greater the resistance became.
“Careful you don’t fall in,” Sara said.
Ozzie straightened up, shaking residual grains from his mitten. “Man, you always make me feel like I’m doing something wrong.”
“People have fallen in before. We don’t risk our own lives trying to find them now. They never leave any trace, it’s not as if there could be any bubbles.”
“Yeah, figures. This stuff isn’t natural. Grains of ice like this should stick together.”
“Of course they should. But they’re being constantly churned up and kept loose, like flour in a food mixer.”
“And the icewhales are doing the churning.”
“Them, and whatever else is down there. After all, they have to eat something.”
“Hopefully just iceweed, or whatever the plant life is at the bottom.”
“You wouldn’t say that if you’d ever seen one.” She turned, and began to walk up the slight incline.
Ozzie started after her. “Why not?”
“Let’s just say they don’t act like herbivores.”
“You got it all figured out, don’tcha?”