unpredictably rough terrain and the likelihood of things breaking down or simply taking longer than expected, he figured they would be lucky if they managed something on the order of ten to twelve days instead, and a much longer time was distinctly possible. Water was going to be a headache, with food and air nearly as bad. They were carrying as much extra water as could be held in a pair of large, pressurized drums, plus enough readymeal packets to last twenty-eight people for twenty days. The air re-circulators both in the cat’s cabin and in their suit PLSS backpacks would extend their breathing time, but they would need occasional recharges of liquid oxygen and nitrogen to make up for the unavoidable loss each time an airlock was opened or a helmet was removed. Garroway’s best back-of-the-envelope calculation said…twenty to twenty-five days, depending on their exertion. If they didn’t make it in that time…well, he could always call for help. That meant surrender, however, an option he was not willing to consider.
Not yet.
During the drive out from Heinlein Station, Garroway, King, and Knox had worked out a rotation schedule for the twelve people outside. Each night after they stopped, every person in the party would spend a two-hour security watch outside, the ones outside exchanging with the ones inside. It looked like no one was going to be getting much sleep on this trek, not with everyone taking a turn freezing in the desert each night.
Garroway had insisted that both he and King take their turns outside with the rest, and he volunteered for the first watch. Alexander had volunteered himself and the other two scientists too, but Garroway had turned him down. Marine Corps armor was designed to stand up to the horrors of the NBC battlefield and, with adequate power, could handle life support for literally days on end. The three scientists were wearing lightweight EVA suits with much weaker heaters and power units, and he didn’t want to risk losing the civilians in his charge.
The Marine armor should be able to take the cold, though he had plenty of reason to question that the first night, as he stomped around outside, trying to stay warm in the pitch-black of the frigid Martian night. Class-One armor was rated at sixty below for four hours, but as far as he knew, no one had tested it yet at lower temperatures. He would have his people stick with two-hour watches, at least for now.
Garroway had a lot of time to think, he found, walking around on the desert with the other outside Marines, trying to keep his feet warm as his suit’s heaters battled the frigid cold. No one spoke. They were officially on radio silence, though everyone had cables and jacks that would let them hard-wire into one another’s intercoms if they wanted to chat. There didn’t seem to be much to talk about, however.
When his watch had ended at last, he’d limped inside, found a place to wedge in between two other Marines, and fallen into an exhausted and fitful sleep. All too soon, King had used the suit intercom to wake him, alerting him to the fact that it was an estimated one hour before daybreak and time to get moving once again.
Soon they’d gotten under way, seeking to put as much distance between themselves and Heinlein Station as they could. Garroway was certain that the UN guards must have some sort of call-in routine, and that call-in was long overdue by now.
The first rays of a golden sunrise were just beginning to touch the floor of Tithonium Chasma as the Mars cat started to climb up a sandy ridge, snaking its way higher and higher up the eastern escarpment of the chasma. During the night, Kaminski had attached his flag to the cat’s whip antenna, and it made a brave sight as it fluttered in the thin wind above the vehicle’s cab. Progress was slow, however, and at times the Marines riding outside had to dismount and carry the sled over rough spots, while the Mars cat ground forward with painful deliberation along the steepening, narrowing path.
By 0900, Mars time, they’d crested a saddle between the two cliff walls. The path cut sharply left and on up to the top of the cliff, where it emerged on flat and open terrain. That, Garroway knew, was the regular crawler route; radar beacons had been set along the path to mark it, and he could see the tracks the cat had left when it’d come this way a few days before. Directly ahead, though, the terrain turned ominous, plunging into a broken and tortured landscape of cliffs, craters, and boulders. According to the maps on board, that was the continuation of the Tithonium Chasma, a narrow and rough-bottomed canyon that ran arrow straight toward Candor.
Garroway tapped the shoulder of the crawler driver—it was Sergeant Caswell this watch—and pointed ahead. She nodded inside her helmet and, without hesitation, gunned the vehicle’s electric motors with the foot pedal and sent them lurching forward.
Bergerac would expect them to take the fast and easy route to Mars Prime, the one over smooth terrain that would get them there in a day or two. By staying in the chaotic badlands of the canyon, Garroway was taking a fearful risk of breakdown or outright catastrophe if the cat slid off a cliff or got mired in soft sand. But the canyon also gave them their best chance of evading the patrols—both on land and in the air—that Bergerac was certain to employ. Marines always avoided the regular paths and trails when they could.
Garroway thought it worth the risk, especially since his comments to Kettering and Vandemeer about staying on the main track might well reach Bergerac’s ears.
He just hoped he’d guessed right, because they were less than a full sol into the march, and it was already beginning to take on some of the overtones of hell.
SATURDAY, 2 JUNE
International Space Station
344 kilometers over the North Pacific Ocean 0915 hours GMT
It was called the International Space Station, and the fiction of global cooperation had been maintained over the years, despite the realities of world politics. The design once planned as Space Station Freedom, and later as the International Friendship Station, had eventually become Earth’s lone orbital spaceport, a spindly, Tinkertoy collection of struts, modules, solar panels, and trusses circling the globe in low Earth orbit.
When construction had begun during the last couple of years of the previous century, the facility had been planned with a twenty-year life expectancy. By 2041, the station was definitely showing its age; it had always been easiest and cheapest simply to add new components to one end of the aging structure, rather than starting fresh with something new. The original station main module, called the Alfa Complex—leaking now through a dozen badly deteriorated pressure seals and valves—was relegated to storage of non-vacuum-sensitive supplies, while the docking facility was located at the far end, eighty meters distant. To either side, four sets of solar panels stretched like vast and glisteningly black damselfly wings spread from the slim and segmented white body.
Despite its age, the ISS remained the premier human facility in orbit, and a true spaceport. When the joint US-UN Return to the Moon mission was launched in 2012, the landers had departed from the ISS. Mars One was assembled there in sections by NASA workers berthed in a temporary hab adjoining the station, and Columbus, the first cycler, was also assembled and launched from the ISS.
There were other stations in LEO as well, Japan and the ESA both had small, independent facilities in the same orbit, some fifty kilometers ahead of the ISS, while the United States maintained a half dozen free-flying stations either in LEO or in higher, polar orbits. The International Space Station, however, was by far the largest, eighty meters long, with solar panels spanning over two hundred meters, with a permanent crew of fifteen to twenty people, and room for as many as fifteen short-term visitors.
In keeping with its designation as a spaceport, its facilities included twelve Shuttle II fuel tanks now filled with water and cryogenic oxygen and hydrogen, fuel for the cyclers, the UN moonships, and the small fleet of tugs that serviced the other space stations in the vicinity and even made weekly treks out to the L-5 facilities. Most of the other LEO stations, in fact, were positioned within a few tens of kilometers of the spaceport, partly
