The call came the third morning after the review meeting. A Beijing number, a landline.
He Zhaoting said: bring your reel, come to Beijing. The machine is on my side. Other hands on it, I don't trust.
She asked: which day.
He said: the sooner the better. The magnetic powder drops every day. Then he hung up. The call had run sixty-one seconds. She checked it against the phone's log—the call before that from him had run two hundred fifty-two seconds, the one where he played the six a.m. session.
Julian date 2459666, Tuesday, she flew to Beijing. On the descent the hiss in her right ear climbed, high enough that she gripped the armrest. Forty minutes after landing it came down to its old height. She made a note on paper: day one hundred sixty, airplane, forty minutes.
The guesthouse stood two stops from his building. There were reporters at the entrance again, more than last time, and the neighborhood committee had set up a table beside them, registering identity cards. The woman at the register looked at Zhou Yan's work unit, looked up, and asked: are you the ones in charge of those dishes. She said yes. The woman turned the register around for her to sign herself and said: then go on up. The old man's kept his light on these past days.
That night she opened her mailbox. The one titled "Shoulder" was still sitting in drafts, last modified 2459483.793. She clicked in. The cursor came down at the head of the body. She typed something, looked at it a while, and deleted it. When she closed the mailbox, the radiator in the room gave one knock, like someone tapping a pipe in the next room.
The study was the same study. One wall of tapes—69.11 calibration, 70.3 flux, 71.8 solar radio, 73.5 lunar-reflection test reception. The open-reel machine on the desk had left the factory in 1981; its belts had been changed twice; the speed was off; still it turned.
He was seventy-four, and his hands shook. Power-on, threading, take-up—she did all of it. He sat to one side and directed; whichever key his finger came down on, that one she pressed. Before they started he had her do three things: wipe the heads with anhydrous ethanol, run ten minutes of a junk reel from '74, set the take-up tension to the mark he named. The headphone sat on his left ear; the right ear faced outward—that ear of his had long since stopped being of use too.
Two enamel cups stood on the desk, the glaze at their rims worn away in a ring. He poured only to seven-tenths, and the spout of the pot never pointed at anyone. The water was plain water. He said: tea makes you pass water. While tape is running you don't leave the machine. From the tape wall he pulled the 69.11 calibration reel, looked at it once, slid it back, label out. All the labels faced out. He said he rewound these tapes once a year, against print-through. Fifty years of rewinding.
Hers was the 24:00 session of April 7. The crease near the outer edge, two fingers wide—he cut it open with scissors, filed the splice flat, laid the splicing tape over it. Then he measured the tape length: three minutes seven seconds missing. He looked at the number and said: missing is missing. When it went missing, none of you were born yet.
Three reels, four sessions to a day. His two reels plus the one she had brought; the 12:00 and the 18:00 sessions were squeezed onto the two sides of the middle reel. They ran from two in the afternoon to two the next morning, and stopped four times; each time he went and drew a glass of water, came back, pressed his left hand down over his right, and then she pressed play.
The power cut out once during the night. The whole building went dark for half a minute. The machine had no UPS behind it; the tape stopped mid-run. In the darkness he said: don't move. Wait for the light. When the light came back he had her run the thirty stopped seconds over again before going on.
Halfway through the 24:00 reel he said the night's only sentence off the subject: I remember this stretch. The temperature dropped that night; the receiver drifted; I tuned it forty minutes. Later she worked it out: those forty minutes fell not long before the missing three minutes seven.
Every reel opened with his voice. Nineteen sixty-eight, he was twenty-two: the date, the time, the machine number, then the reference tone off the signal generator—one thousand cycles a second, thirty seconds. When the young voice sounded in the study, the old man didn't move. He only turned the volume down two notches.
Played back now, the reference tone read nine hundred ninety-three cycles. The tape speed had slowed, seven parts in a thousand. Hu Yisu said later, on the phone, that this one number could drag the level calibration of every reel back into true. He said: Professor, fifty years ago that man left you a calibration.
Midway through the 12:00 reel he said suddenly: stop. Back thirty seconds.
She backed it up. He listened through, and asked: this cluster—repetition period. She measured: 71 milliseconds. He said: the northwest. That unit, I tuned it two years. A pause, and then: write it down. Cluster seven. Eleven of us worked there that year. Still able to sign the identification column—only me.
The Beijing page lay beside the machine. After 12, 18, 24 he filled the numbers in one by one: 999.7, 1000.4, 999.1. The measured value of the reference tone at the head of each reel. Calibrate first, then listen to the content. Fifty years, and the order had never changed.
They finished at two in the morning. He walked her to the door and said one thing: the rest you take away and compute. The numbers that come out—not one word of them gets changed on my account.
She stood in the corridor a while before going down. He didn't ask her to stay. Before the door shut he said: tell the driver to take it slow. She never told him she had come by subway.
She was reading spectra already on the flight back to Kashgar.
The 12:00 reel: under the calibration pulses, the shortwave band was not empty. Sorted by repetition period and sweep rate, one hour of recording broke out into thirty-one clusters. She called up the injection-history audit table to check against it—coherent sources on the register that year: eleven.
Thirty-one minus eleven. Twenty clusters, in no record anywhere. The spectrum spread column by column; the sky of 1968 lay open on the screen like an old X-ray film—every metal that appeared in no archive stood upright on the film.
Hu Yisu inverted each cluster's parameters into power. The reference tone had nailed down tape speed and level both: 993 against 1000, speed off by seven parts in a thousand, level off by 0.03 decibels after the log—both correctable. Computed into the small hours, he sent over a table: on the over-the-horizon radar cluster alone, the inverted peak came out forty times the assumed value in the audit table's 1968 row.
The thirty-one clusters were ranked by inverted power. The three largest all lay to the north, their bearings joining into one arc. The unit He Zhaoting himself had tuned ranked seventeenth—mid-table, neither good nor bad. Of the twenty nameless clusters, only six bore south. He said on the phone: down south, nobody had machines standing in those years. She asked him to put that sentence into the notes. He waved it off: eleven clusters I can recognize. Past that I don't guess.
Forty times. She sat a long time in her office, then turned the memo to that page. The line read: the total energy of a hundred years of coherent transmission equals eighty-eight days of the Sun in the same band. In the margin, in her own hand, four words: we're not loud enough.
Mateo ran it himself the next day, on his own clock and with error bars of his own. He wrote back: forty, give or take—inside your error. Don't thank me. Then he added one more: this time it isn't a half-finished thing. It's your finished one. Kramer followed, asking for the audio originals. The only reply was the line from the page He Zhaoting had copied everyone: the originals don't leave this room.
Redrawing the whole curve took a week. When it was done she read the number three times over: the total had gone from eighty-eight days to fourteen months.
The memo put out an erratum. The first since v3. The erratum page carried one line of body text: the energy estimate of Section Four is withdrawn; re-estimated per the original records of April 7, 1968—see the appendix table. The appendix table was hers, forty-one rows. Before it went out she struck the four words we're not loud enough out of the margin. Struck lightly. Still legible.
He Zhaoting went public one day ahead of her erratum.
He didn't appear. He sent the digitized files, the calibration records, and one page of notes to the nineteen signatory units and the framework secretariat, all with checksums. The notes were a photocopy of a handwritten table: thirty-one pulse clusters, the eleven he could recognize, each tagged with a name or a bearing; the twenty he couldn't, parameters only. Below the table, two lines.
Line one: what's not on the lists outnumbers what I can recognize.
Line two: the above rests on records taken while I was present and fifty years of listening. The errors are mine. The originals don't leave this room.
The next day the world's headlines came in only two kinds. One read: we were never quiet. The other read: a hundred years of noise didn't wake it—so it can't be woken. Both quoted the same forty. The guilty and the absolved each found, in the same data, the thing they needed, declared victory, and declared each other dead.
Hu Yisu screenshot the two headlines side by side and sent them to her: same number. One side enters it as evidence of guilt, the other as evidence of innocence. Different uses; the number is the same number.
Nobody raised Director Cao's twelve points anymore. The office that had issued them posted one line to the group: the injection-history estimate having failed, every causal statement founded on it fails with it—the ones in our favor and the ones against us alike. There was a typo in the last sentence; no one pointed it out. Observer Guan himself never spoke again; word was he had withdrawn his signature from the assessment report.
On the third day a letter reached the station, signed with a name no one knew. The writer said he was the son of one of those eleven; his father had died in '79. Setting the public parameter table against his memory, he thought cluster nineteen might be the unit his father had kept, and asked whether he could be sent a copy of that one minute of sound. At the foot of the letter, on a line of its own: the sound of that machine, I heard it as a child, outside the machine room. The paper was squared exercise paper, fountain pen, pressed hard—you could feel the grooves from the back. Zhou Yan photographed the letter into 3t and wrote back: yes. The postscript she added: the originals are with my teacher. He is the one who signed the identification column.
Old Qiao telephoned too, asking whether the 2004 duty log was still there—people outside were asking after it. She said it was, locked up. Old Qiao said: locked is good. Those two characters went unmentioned—by him and by her.
Amina read a statement on behalf of the framework, from the script, four minutes, the central sentence being: the information at hand is insufficient to support any update of the conclusions in any direction. She finished, closed the script, waited three seconds, and left.
A television station dug out 1968 newsreel and ran it again. The radar antenna turned for a minute on the film; half of what the announcer read was the same batch as today's wire copy in every country. Outside the archive, people queued to call up the 1968 newspaper bound volumes; the archivist said that in thirty years no one had ever asked for those months.
The signs on the street had changed their wording again. The Sleepkeepers carried: quiet first, reckon later. On the Wake faction's T-shirts, "see" had been replaced by "three times as loud, and still for nothing." Three times was wrong—it was forty times. Nobody fixed it. Neither side did. Hu Yisu wanted to mail them a letter of correction. She stopped him: don't mail a solved problem to either faction.
Zhou Yan looked and looked and saw one thing only: the ledger everyone had spent a hundred days shouting over was wrong. Not the direction—the scale. With a number off by one to two orders of magnitude, they had confessed one sin and been absolved of one.
Saturday, 2459670, 20:00. The video call ran four minutes twenty seconds. Zhou Yao said the school had organized a viewing of the released footage, and her classmates asked why there was only beeping in the tapes, and nobody talking. The teacher said nobody was talking—that was all machines. Zhou Yao said: machines are run by people, though.
Zhou Yan said mm. That's why there's a ledger.
Zhou Yao said: can a ledger like that ever come out clean?
Zhou Yan said: it's being recomputed.
After the call she went to feed Lao Wu. Water twenty degrees; the shell still unmolted. She counted out five shrimp pellets, and watched him slowly reach the first one.
Through the waiting days she went on with the paper records. Of the fourteen thousand six hundred, she had reached eleven thousand forty. The ink-bleed cell was settled at last as a 3—Shanghai had turned up the duty operator's handover book from that year, and the transcribed value for the 12:00 slot was 73; her 8 had been an artifact of the blot. In the remarks column she struck out "pending" and wrote: 73, per handover book.
Through those twenty-one days S was computed as always. Lines one hundred one through one hundred four: 0.37, 0.37, 0.36, 0.37. She didn't send them to the group; she wrote them on paper only. Beside the finished lines she set a pencil dot, one a day. Four dots.
Ursula's message came on Monday morning.
After a day of silence in the group, she posted four lines.
The tapes have arrived.
The injection history is not background. It is input. The input has changed.
Line seven—I am going to recompute it. Give me twenty-one days.
Do not ask me anything in between.
Nobody answered. Hu Yisu typed a few words and deleted them; the input-method prompt surfaced three times; in the end he sent nothing. Zhou Yan read the four lines twice, backed out, went in again, and read them once more.
Line seven. She had seen that line. The printed formula sheet pinned to the white wall in Vienna, three thumbtacks; line seven carried the pending term Ursula had named herself—the cosmetic. More than a year now. It had shown its name and nothing else: no value, not one word of explanation.
She opened the paper notebook to a fresh page. She wrote 40. She wrote fourteen months. She wrote three minutes seven seconds. Last, in the corner of the page, she wrote:
21.