Green mars (61 page)

At this stage the Minus One settlement, on the northwest point of the high ground, was no more than an array of runways, rocket pads, dirigible masts, and an untidy collection of small buildings— a few under a small station tent, the rest standing isolate and bare, like concrete blocks dumped from the sky. No one lived there but a small technical and scientific staff, although visiting areologists dropped in from time to time.

The Three Diamonds swung around and latched on to one of the poles, and was hauled down to the ground. The passengers left the gondola by a jetway, and were given a short tour of the airport and residential habitat by the stationmaster.

After a forgettable dinner in the dining hall of the habitat, they suited up and took a walk outside, wandering through the scattered utilitarian buildings, downhill to what one of the locals said would eventually be the shoreline. They found when they got there that no ice was yet visible from this elevation; it was a low sandy rubble-strewn plain, all the way out to the nearby horizon, some seven kilometers away.

Maya strolled aimlessly behind Diana and Frantz, who seemed to be commencing a romance. Beside them walked another native couple who were based at the station, both even younger than Diana, arm in arm, very affectionate. They were both well over two meters tall, but not lithe and willowy like most of the young natives—this couple had worked out with weights, bulking up until they had the proportions of Terran weight lifters, despite their great height. They were huge people, and yet still very light on their feet, doing a kind of boulder ballet over the scattered rocks of this empty shore. Maya watched them, marveling again at the new species. Behind her Sax and Spencer were coming along, and she even said something about it over the old First Hundred band. But Spencer only said something about phenotype and genotype, and Sax ignored the remark, and took off down the slope of the plain.

Spencer went with him, and Maya followed them, moving slowly over all the other new species: there were grass tufts dotting the sand between the rocks of the rubble, also low flowering plants, weeds, cacti, shrubs, even some very small gnarled trees, tucked into the sides of rocks. Sax wandered around stepping gingerly, crouching down to inspect plants, standing back up with an unfocused look, as if the blood had left his head while he was crouching. Or perhaps this was the look of Sax surprised, something Maya could not recall seeing before. She stopped to stare around her; it was in fact surprising to discover such profligate life, out here where no one had cultivated anything. Or perhaps the scientists stationed at the airport had done it. And the basin was low, and warm, and humid... . The young Martians upslope danced over it all, gracefully avoiding the plants without taking any notice of them.

Sax stopped in front of Spencer and tilted his helmet back so that he was staring up into Spencer’s faceplate. “These plants will all be drowned,” he said querulously, almost as if asking a question.

“That’s right,” Spencer said.

Sax briefly glanced toward Maya. His gloved fingers were clenching in agitation. What, was he accusing her of murdering plants now too?

Spencer said, “But the organic matter will help sustain later aquatic life, isn’t that right?”

Sax merely looked around. As he looked past her, Maya could see he was squinting, as if in distress. Then he took off again across the intricate tapestry of plants and rocks.

Spencer met Maya’s gaze and lifted his gloved hands, as if to apologize for the way Sax was ignoring her. Maya turned and walked back upslope.

Eventually the whole group walked up a spiraling ridge, above the contour to a knoll just north of the station, where they were high enough to get a view of the ice on the western horizon. The airport lay below them, reminding Maya of Underbill or the Antarctic stations—unplanned, unstructured, with no sense at all of the island town that was sure to come. The youngsters as they stepped gracefully over the rocks speculated about what that town would look like—a seaside resort, they were sure, every hectare built up or gardened, with boat harbors in every little indentation of the shoreline, and palm trees, beaches, pavilions... . Maya closed her eyes and tried to imagine what the young ones were describing—opened them again, to see rock and sand and scrubby little plants. Nothing had come to her mind. Whatever the-future brought would be a surprise to her—she could form no image of it, it was a kind of jamais vu, pressing at the present. A sudden premonition of death washed over her, and she struggled to shrug it off. No one could imagine the future. A blank there in her mind meant nothing; it was normal. It was only the presence of Sax that was disturbing her, reminding her of things she could not afford to think of. No, it was a blessing that the future was blank. The freedom from deja vu. An extraordinary blessing.

Sax trailed behind, looking off at the basin below them.

The next day they climbed back in the Three Diamonds and took to the air again and floated southeast, until the captain dropped an anchor line just to the west of the Zea Dorsa. It had been quite a while since Maya had driven out onto them with Diana and her friends, and now the ridges were no more than skinny rock peninsulas, extending out into the shattered ice toward Minus One, and diving under the ice one after the next—all except for the largest one, which was still an unbroken ridge, dividing two rough ice masses, the western ice mass clearly about two hundred meters lower than the eastern one. This, Diana said, was the final line of land connecting Minus One and the basin rim. When this isthmus was overwhelmed, the central rise would be an actual island.

The ice mass on the eastern side of the remaining dorsum was at one point very near to the ridgeline. The dirigible captain let out more anchor line and they floated east on the prevailing wind until they were directly over the ridge, where they could see clearly that only meters of rock remained to be overcome. And off to the east was a walking pipeline, a blue hose sliding slowly back and forth on its ski pylons as its nozzle shot water onto the surface. Under the drone of the props, they could hear occasional creaks and moans from below, a muffled boom, a high crack like a gunshot. There was liquid water below the ice, Diana explained, and the weight of new water on top was causing some sections of ice to scrape over barely submerged dorsa. The captain pointed to the south, and Maya saw a line of icebergs fly into the air as if propelled by explosives, arcing in various directions and falling back onto the ice, breaking into thousands of pieces. “Maybe we’d better back off a little,” the captain said. “It would be better for my reputation if we did not get shot out of the sky by an iceberg.”

The walking pipeline’s nozzle was pointing their way. And then, with a faint seismic roar, the last complete ridge was overwhelmed. A rush of dark water ran up the rock, and then poured down the western side of the ridge in a waterfall some hundred meters wide. It fell the two hundred meters of its descent in a slow lazy sheet. In the context of the great ice world stretching to the horizon in every direction, it was no more than a trickle—but it kept pouring steadily, the water on the eastern mass now channelized by ice on its sides, the falls booming like thunder, the water on the western side fanning out in a hundred streams through the broken ice— and the hair on Maya’s neck lifted in fear. Probably a memory of the Marineris flood, she decided, but couldn’t say for sure.

Slowly the volume of the waterfall decreased, and in less than an hour it had all slowed and then frozen, at least on the surface; though a sunny fall day, it was eighteen degrees below freezing down there, and a line of ragged cumulonimbus clouds was approaching from the west, indicating a cold front. So the waterfall eventually stilled. But left behind was a fresh icefall, coating the rock ridge with a thousand smooth white tubes. So now the ridge had become two promontories which did not quite meet, like all the other ridges of the Zea Dorsa, all diving into the ice like sets of matching ribs: matching peninsulas. The Hellas Sea was continuous now, and Minus One truly an island.

After that, the circumHellas train trips and the various overflights felt different to Maya, as she perceived the interlaced network of glaciers and ice chaoses in the basin to be the new sea itself, rising and filling and sloshing around. And in fact the liquid sea under the surface ice near Low Point was growing much faster in the springs and summers than it was shrinking in the autumns and winters. And strong winds kicked up waves in the polynyas, which in the summers broke the ice between them, creating regions of brash ice, a floating pack of ice chunks which growled so loudly as they rode the steep little swells that conversation in dirigibles overhead was difficult.

And in the year M-49, the flow rates from all the tapped aquifers reached their maximums, combining to pump 2,500 cubic meters a day into the sea, an amount that would fill the basin to the — 1-kilometer contour in about six M-years. To Maya this did not seem long at all, especially as they could see the progress, right there on Odessa’s horizon. In winters the black storms that poured over the mountains would blanket the whole basin floor with startling white snow; in the springs the snow would melt, but the new edge of the ice sea would be closer than it had been the previous autumn.

It was much the same in the northern hemisphere, as news reports and her infrequent trips to Burroughs made clear. The great northern dunes of Vastitas Borealis were being rapidly inundated, as the truly enormous aquifers under Vastitas and the north polar region were being pumped onto the surface by drilling platforms that rose on the ice as the ice accumulated under them. In the northern summers, great rivers were pouring off the melting northern polar cap, cutting channels through the laminate sands and running down to join the ice. And a few months after Minus One had been islanded, news reports showed video of an uncovered stretch of ground in Vastitas, disappearing under a dark flood from west and east and north. This apparently created the last link between the lobes of ice; so now there was a world-wrapping sea in the north. Of course it was patchy still, and covered only about half of the land between the sixtieth and seventieth latitudes, but as satellite photos showed, there were already great bays of ice extending south into the deep depressions of Chryse and Isidis.

Submerging the rest of Vastitas would take about twenty more M-years, as the amount of water necessary to fill Vastitas Borealis was much greater than that needed to fill Hellas. But the pumping operation up there was bigger as well, so things were proceeding apace, and all the acts of Red sabotage combined could do no more than put a dent in this progress. In fact progress was accelerating despite increasing acts of sabotage and ecotage, because some of the new mining methods being put into use were quite radical, and very effective. The news programs showed video of the latest method, which set off big underground thermonuclear explosions, very deep under Vastitas. This melted the permafrost over large areas, providing the pumps with more water. On the surface these explosions were manifested as sudden icequakes, which reduced the surface ice overhead to a bubbling slurry, the liquid water soon freezing on the surface, but tending to stay liquid underneath. Similar explosions under the northern polar cap were causing floods nearly as vast as the great outbursts of “61. And all that water was pouring downhill into Vastitas.

Down at the office in Odessa, they followed all of this with professional interest. A recent assessment of the amount of underground water in the north had encouraged the Vastitas engineers to shoot for a final sea level very near the datum itself, the 0-kilometer contour that had been set back in the days of sky areology. Diana and other hydrologists in Deep Waters thought that subsidence of the land in Vastitas, as a result of the mining of aquifers and permafrost, would cause them to end up with a sea level somewhat lower than the datum. But up there they seemed confident they had factored that in, and would reach the mark.

Fooling around with various sea levels on an office AI map made it clear what shape the coming ocean was likely to have. In many places the Great Escarpment would form its southern shoreline. Sometimes that would mean a gentle slope; in the fretted terrain, archipelagos; in certain regions, dramatic seaside cliffs. Broached craters would provide good harbors. The Elysium massif would become an island continent, and the remains of the northern polar cap would as well—the land under the cap was the only part of the north well above the 0-kilometer contour.

No matter which exact sea level they chose to display on the maps, a big southern arm of the ocean was going to cover Isidis Planitia, which was lower than most of Vastitas. And aquifers in the highlands around Isidis were being pumped down into it as well. So a big bay was going to fill the old plain, and because of that, construction crews were building a long dike in an arc around Burroughs. The city was located fairly close to the Great Escarpment, but its elevation was just below the datum. It was therefore going to become a port city every bit as much as Odessa, a port city on a world-wrapping ocean.

The dike they were building around Burroughs was two hundred meters high and three hundred meters wide. Maya found the concept of a dike to protect the city disturbing, though it was clear from the aerial shots taken of it that it was another pharaonic monument, tall and massive. It ran in a horseshoe shape, with both its ends up on the slope of the Great Escarpment, and it was so big that there were plans to build on it, to make it into a fashionable Lido district, containing small boat harbors on its water side. But Maya remembered once standing on a dike in Holland, with the land on one side of her lower than the North Sea on the other side of her; it had been a very disorienting sensation, more unbalancing than weightlessness. And, on a more rational level, as news programs from Earth now showed, all dikes there were currently stressed by a very slight rise in sea level, caused by global warming initiated two centuries before. As little as a meter’s rise endangered many of the low-lying areas of Earth, and Mars’s northern ocean was supposed to rise in the coming decade by a full kilometer. Who could say whether they would be able to fine-tune its ultimate level so accurately as to make a dike sufficient? Maya’s work in Odessa made her worry about such control, though of course they were trying for it themselves in Hellas, and thought that they probably had it. They had better, as Odessa’s location gave them little margin for error. But the hydrologists also talked about using the “canal” that had been burned by the aerial lens before its destruction, as a runoff into the northern ocean, if such a runoff became necessary. Fine for them, but the northern ocean would have no such recourse.