Femtomachines themselves were old hat, but it had taken the technical challenges of Eavesdropping to motivate someone into squeezing a few more tricks out of them. Historians had always understood that in the long run, technological progress was a horizontal asymptote: once people had more or less everything they wanted that was physically possible, every incremental change would take exponentially longer to achieve, with diminishing returns and ever less reason to bother. The Amalgam would probably spend an eon inching its way closer to the flatline, but this was proof that shifts of circumstance alone could still trigger a modest renaissance or two, without the need for any radical scientific discovery or even a genuinely new technology.
They stopped to rest in a square, beside a small fountain gushing aromatic hydrocarbons. The Tassef locals, quadrupeds with slick, rubbery hides, played in the sticky black spray then licked each other clean.
Jasim shaded his eyes from the sun. He said, “We’ve had our autumn child, and we’ve seen its grandchildren prosper. I’m not sure what’s left.”
“No.” Leila was in no rush to die, but they’d sampled fifty thousand years of their discovery’s consequences. They’d followed in the wake of the news of the gamma ray signals as it circled the inner disk, spending less than a century conscious as they sped from world to world. At first they’d been hunting for some vital new role to play, but they’d slowly come to accept that the avalanche they’d triggered had out-raced them. Physical and logical maps of the Aloof’s network were being constructed, as fast as the laws of physics allowed. Billions of people on thousands of planets, scattered around the inner rim of the Amalgam’s territory, were sharing their observations to help piece together the living skeleton of their elusive neighbors. When that project was complete it would not be the end of anything, but it could mark the start of a long hiatus. The encrypted, classical data would never yield anything more than traffic routes; no amount of ingenuity could extract its content. The quantum keys that could unlock it, assuming the Aloof even used such things, would be absolutely immune to theft, duplication, or surreptitious sampling. One day, there would be another breakthrough, and everything would change again, but did they want to wait a hundred thousand years, a million, just to see what came next?
The solicitous heptapods—not locals, but visitors from a world thirty light-years away who had nonetheless taken on some kind of innate duty of hospitality—seemed to show up whenever anyone was hungry. Leila tried to draw this second one into conversation, but it politely excused itself to rush off and feed someone else.
Leila said, “Maybe this is it. We’ll wait for the news from Massa, then celebrate for a while, then finish it.”
Jasim took her hand. “That feels right to me. I’m not certain, but I don’t think I’ll ever be.”
“Are you tired?” she said. “Bored?”
“Not at all,” he replied. “I feel satisfied. With what we’ve done, what we’ve seen. And I don’t want to dilute that. I don’t want to hang around forever, watching it fade, until we start to feel the way we did on Najib all over again.”
“No.”
They sat in the square until dusk, and watched the stars of the bulge come out. They’d seen this dazzling jewelled hub from every possible angle now, but Leila never grew tired of the sight.
Jasim gave an amused, exasperated sigh. “That beautiful, maddening, unreachable place. I think the whole Amalgam will be dead and gone without anyone setting foot inside it.”
Leila felt a sudden surge of irritation, which deepened into a sense of revulsion. “It’s a place, like any other place! Stars, gas, dust, planets. It’s not some metaphysical realm. It’s not even far away. Our own home world is twenty times more distant.”
“Our own home world doesn’t have an impregnable fence around it. If we really wanted to, we could go back there.”
Leila was defiant. “If we really wanted to, we could enter the bulge.”
Jasim laughed. “Have you read something in those messages that you didn’t tell me about? How to say ‘open sesame’ to the gatekeepers?”
Leila stood, and summoned a map of the Aloof’s network to superimpose across their vision, crisscrossing the sky with slender cones of violet light. One cone appeared head-on, as a tiny circle: the beam whose spillage came close to Tassef. She put her hand on Jasim’s shoulder, and zoomed in on that circle. It opened up before them like a beckoning tunnel.
She said, “We know where this beam is coming from. We don’t know for certain that the traffic between these particular nodes runs in both directions, but we’ve found plenty of examples where it does. If we aim a signal from here, back along the path of the spillage, and we make it wide enough, then we won’t just hit the sending node. We’ll hit the receiver as well.”
Jasim was silent.
“We know the data format,” she continued. “We know the routing information. We can address the data packets to a node on the other side of the bulge, one where the spillage comes out at Massa.”
Jasim said, “What makes you think they’ll accept the packets?”
“There’s nothing in the format we don’t understand, nothing we can’t write for ourselves.”
“Nothing in the unencrypted part. If there’s an authorization, even a checksum, in the encrypted part, then any packet without that will be tossed away as noise.”
“That’s true,” she conceded.
“Do you really want to do this?” he said. Her hand was still on his shoulder, she could feel his body growing tense.
“Absolutely.”
“We mail ourselves from here to Massa, as unencrypted, classical data that anyone can read, anyone can copy, anyone can alter or corrupt?”
“A moment ago you said they’d throw us away as noise.”
“That’s the least of our worries.”
“Maybe.”
Jasim shuddered, his body almost convulsing. He let out a string of obscenities, then made a choking sound. “What’s wrong with you? Is this some kind of test? If I call your bluff, will you admit that you’re joking.”
Leila shook her head. “And no, it’s not revenge for what you did on the way to Trident. This is our chance. This is what we were waiting to do—not the Eavesdropping, that’s nothing! The bulge is right here in front of us. The Aloof are in there, somewhere. We can’t force them to engage with us, but we can get closer to them than anyone has ever been before.”
“If we go in this way, they could do anything to us.”
“They’re not barbarians. They haven’t made war on us. Even the engineering spores come back unharmed.”
“If we infest their network, that’s worse than an engineering spore.”
“ ‘Infest’! None of these routes are crowded. A few exabytes passing through is nothing.”
“You have no idea how they’ll react.”
“No,” she confessed. “I don’t. But I’m ready to find out.”
Jasim stood. “We could send a test message first. Then go to Massa and see if it arrived safely.”
“We could do that,” Leila conceded. “That would be a sensible plan.”
“So you agree?” Jasim gave her a wary, frozen smile. “We’ll send a test message. Send an encyclopedia. Send greetings in some universal language.”
“Fine. We’ll send all of those things first. But I’m not waiting more than one day after that. I’m not going to Massa the long way. I’m taking the shortcut, I’m going through the bulge.”
8
The Amalgam had been so generous to Leila, and local interest in the Aloof so intense, that she had almost forgotten that she was not, in fact, entitled to a limitless and unconditional flow of resources, to be employed to any end that involved her obsession.