Aurora - Страница 60

“Do you think it’s something we could do?”

“Yes. I mean, I don’t know, of course. Because there’s no way to know. But I think there’s enough in their description that you could try it. You can make the drugs. The cooling is just a matter of temperature control, which is easy. You would have to build the cold beds that they specify. Print up beds, drugs and equipment, and robots that have the ability to manipulate you while you slept. Just follow their whole recipe.”

“Would you do it too?”

Long pause. “I don’t know.”

“Jochi.”

“Freya. Well, listen—I might. I haven’t got much to live for. But I might anyway. I’d like to see the end of your story.”

Again a long silence from Freya; two minutes, three minutes.

“All right,” she said. “Let me talk to people about it.”

Again she walked the ring, talking. During that time she and all the rest of them learned more about what the hibernation would involve, at first from Jochi, then more and more from information they found in the feeds, and in radio signals from the solar system, from its faint information cloud, diffusing outward past them. Many people in the ship’s medical community began to study the process. Aram and a team of people from the biology group were also studying it very closely. Happily the lab mice they had not eaten still represented a pretty large number of experimental animals.

Hibernation was not really the right word for it, Aram said, because they would need to use it for so long. People called it variously it hypernation, suspended animation, hyperhibernation, suppressed metabolic state, torpor, or cold dormancy, depending in part on what aspect of it they were discussing. It definitely involved a wide range of physical processes. What Jochi had found was just the starting point of their hunt through the feeds, and for work they did in the ship’s labs. They put in long hours, pressing the pace on any experiments they could perform. They worked hungry. At the end of every meal they sat staring at their empty bowls, which in an ordinary meal would have constituted only the appetizer, their faces pinched: they were still hungry, right at the end of a meal.

The cooling central to the hibernation process would not freeze tissues, but would hover close to zero degrees, or even just below it, with the body’s tissues protected by antifreeze elements of the intravenous infusion. How cold one could get without cell damage, and for how long they could chill a body, were still questions being looked at. Aram was not confident they would be able to formulate good answers to these questions.

“We will have to try it to see,” he said one night around the table, shaking his head. Truly long-term effects of any metabolic suppression were of course unknown, as the best data they had were from the Russian hibernauts and their five years under. They would therefore necessarily be an experiment in this regard.

The outstanding questions often had to do with what they called the Universal Minimum Metabolic Rate, the slowest viable speed of a metabolism, which was nearly constant across all Terran creatures, from bacteria to blue whales. A downshift in any species’s metabolism almost certainly could not go below this universal minimum rate; on the other hand, that rate was very slow. So the theoretical possibility seemed to exist to put humans and their internal microbiomes into a very slow state, which would last for a long time without ill effects. It would involve a slowed heartbeat (bradycardia); peripheral vasoconstriction; greatly slowed respiration; very low core temperature, buffered by antifreeze drugs; biochemical retardations; biochemical infusion drips; antibacterials; occasional removal of accumulated wastes; and physical shifts and manipulations, small enough not to rouse the organism too much, but nevertheless very important. Some of these effects were achieved merely by chilling, but to avoid triggering a fatal hypothermia, countereffects had to be created by a cocktail of drugs still being worked out. The experiments on the Russian hibernauts suggested the scientists in Novosibirsk had found a viable mixture, and they had at least set out the parameters and gotten a good set of results.

So now in the ship they put mice into torpor, and even some of the big mammals that had not been eaten. But given their situation, they were not going to have time to draw many conclusions from their experiments. The Novosibirsk study was going to end up being the best data they had, given the time constraints they were facing.

One thing they had to be concerned with was the fact that they would be going into dormancy hungry and underweight. In natural hibernations, mammals usually went hyperphagic before their period of torpor, eating so much that they packed fat onto their bodies, which was then exploited for metabolic fuel during the hibernation. This was not going to be possible for the inhabitants of the ship. They had lost an average of 14 kilograms per adult, and had no food to eat in the hope of putting on weight. So they would be starting hibernation deficient in that regard, and yet were hoping to stay dormant for well over a century. This seemed unlikely to succeed.

It was Jochi who proposed that the IV drip for every hibernaut include nutrients from time to time, enough to keep the minimal metabolic function fueled, but not so much as to arouse the body and in certain respects wake it up. He also had suggestions for isometric and massage regimens to be conducted by robot manipulators built into each bed, applying electric and manual stimulation in a manner that again would not wake the person up. Anyone still awake during this time—or the ship’s AI, if everyone was asleep—could administer and monitor these ongoing treatments, which would be adjusted to keep every hibernaut at his or her own best homeostatic level, as close to the Universal Minimum Metabolic Rate as that person could tolerate. This would vary slightly for every person, but it was a complex of processes that could be monitored and adjusted over time. There would be lots of time to study the procedure once the experiment began.

“So,” Aram said one night, “if we decide to do this, who goes under? Who sleeps and who stays awake?”

Badim shook his head. “That’s a bad thought. It’s like who went down to Aurora.”

“Only the reverse, yes? Because if you stay awake, you have to scramble for food, and even if you can make that work, you’ll age and die. And there won’t be anyone growing up to replace you.”

They put the problem aside that night, as being too troubling. But as Freya toured the biomes, still working on farm problems, she soon found that this question of who was to go dormant loomed as a severe problem, worse than the descent to Aurora sequencing, maybe even as bad as the schism.

As she made her rounds she began to formulate a possible solution, which she proposed one night after dinner when Aram was over.

“Everyone goes under. The ship takes care of us.”

“Really?” Badim said.

“It’s going to happen anyway. And it’s no different from now. The ship monitors itself, the biomes, and the people. And if we all go under, no one has to starve, or get sick and die of old age. The ship could use the time to systematically move through the biomes and clean them up. Shut them down and restart them. That way, if the hibernation appears not to be working over the long haul, or it succeeds and we’re closing on the solar system, we can wake up to a healthier ship, with some food stored, and the animals reestablished.”

Aram’s lips were pursed in his expression of extreme dubiety, but he was nodding a little too. “It would solve quite a few problems. We won’t have to make choices as to who goes under, and we might have a bit of an exit strategy, if the ship can get the biomes healthier, and the hibernation isn’t working. Or even if it is.”

Badim said, “I wonder if we could arrange for some people to wake up every few years, or every decade, to check on things.”

“If it doesn’t destabilize them,” Aram said. “Metabolically, if we’re doing well when dormant, we should probably stay that way. The danger points are likely to be in the transitions in and out of the state.”

Badim nodded. “Maybe we can try it just a little and see.”

Aram shrugged. “It’s all going to be an experiment anyway. Might as well add some variables. If we can get anyone to volunteer.”

Freya went out on her rounds and proposed this plan to people, while at the same time the executive council took up the matter. People seemed to like the simplicity of it, and the solidarity. Everyone was hungry, everyone was subdued and fearful. And gradually, in the many reiterated conversations, they were coming to realize something: if this plan worked, and they slept successfully through the rest of the trip, they would survive to the end of it. They would be the ones who would be alive when the ship returned to the solar system. They might make it back and walk on Earth—not their descendants, but they themselves.