[ECHO ARCHIVE · LAYER 3 · 51.9% DECODED · KEY: LIVE SOUND FROM THE 2008 SUMMER OLYMPICS OPENING CEREMONY BROADCAST]
Day 326, 03:11:44, step 329. No frame.
The key registry came over from the pool overnight: thirty-one keys in all. Three verified: the 1987 line, the 0.9 seconds from 2008, the ei from 2021. The remaining twenty-eight were candidates the stations had reported over the years—never verified, never retired, hanging on the registry the whole time. The key-running split into two halves: Xiao Gao took the first half of the night, I took the second. The protocol was mine to write: every key in three variants—the original fingerprint; downsampled to that year's broadcast quality; padded with one second of silence at either end. Into the key field, and wait for the receipt.
Receipts came in two kinds. Wrong returned F—four digits, all F. Empty returned zero—four digits, all zero.
The directory table's year bytes were all F back then; I knew that code well. Thirty-one keys, ninety-three variants, running from the night of day 326. By the small hours of day 330 all twenty-eight candidates had answered: F, every one. The three verified keys, their variants sent in one after another: zero, every time.
Xiao Gao pinned the receipts into a stack and counted the numbers in the page footers. "The candidates got 'wrong.' The verified ones didn't even manage to be wrong." "Mm," I said. "How do you mean?" he said. "Write it down first. Don't say it yet."
He turned back through the stack. "Why don't we make keys out of what came after 2021 as well. Popular audio off the internet—I can nominate thirty." "Nominate them." The registry went to sixty-one keys. When the running finished: fifty-eight had returned F, three had returned zero. The day the variants passed number fifty-one, the fan on the key-running machine began to make noise—a bearing's noise. I passed a repair ticket up; in the purpose line I wrote: not urgent.
The next day a letter came from S-19: they had re-encoded the three verified keys into their country's broadcast standard of the era and run them again. Receipts attached: three lines of zero. One sentence in their letter: recommend retaining this receipt as evidence of the key-slot state. Xiao Gao read the sentence out loud. "Zero can be evidence too." "They're right," I said. "If zero weren't evidence, we wouldn't even have a nothing."
Those days the corridor lights in the building were replaced—sound-activated ones swapped for always-on, part of a unified energy retrofit. For the first two days nobody's feet had adjusted: people reached the stairwell, stamped a foot, the light ignored them, they stood a half beat, then walked. The stamping went on in the stairwells for a week before it faded. Passing the shop across the way on my way in, I saw the wind had taken one corner off the TRANSFER sheet; half the word still hung on the glass. Inside, the table had been carried out. Its marks stayed on the floor—four legs, a shallow ring of dust.
On day 334 a postcard came to the gatehouse, the postmark the nineteenth again. Tong set it into its place in the row on the windowsill and stopped halfway through. He counted. "Last month's didn't come." He put the new one where it belonged, one square short in front of it, and filled the gap with nothing. "A month skipped." "Mm," I said. "Leave it empty," he said. "Empty is also a record."
That month the foreign papers' column moved on to its third question: "Who Keeps the Answers for Us." One issue every three days, none missed—the number Shen Yi had given, not off by a day. Online, somebody screenshotted the half-sentence "persons possibly related to the project" from the minutes and listed seven names beneath it. Xiao Gao looked it over. "The first name they guessed was Adebayo." Him being gone was better for him: gone, there was no one left to speak in his defense. He set his phone face-down on the desk, a little harder than usual.
On the afternoon of day 335 I went to the audio group's machine room to find Master Lu. His headphones hung around his neck, and what he was playing were the three segments pulled from the archive: the 1987 line, a man's voice, read flat; the 0.9 seconds from 2008—the countdown, the silence, the breath at the end; the ei from 2021, drawn out long, tipping up a little at the close. He played all three through and waited until I had the headphones off before he spoke.
"Keys are all sound," he said. "This one has no sound yet."
"How do you run a key that has no sound?"
"Wait for it to sound."
He played the three segments through again in order, this time listening to the speakers himself. When they finished he turned the volume knob to zero. "The first key: fifty-odd years after the fact, and it matched. The second: thirty-odd years. The third: twenty-odd years. It keeps closing in. Close enough at the end that it closes on the sound that hasn't sounded yet." He wasn't looking at me as he said it. He was looking at the open-reel deck that never powers on.
On day 340 Ye Zhen finished the last of the sixty-one cards. When it was written she moved the iron clip so the new card slotted into the row. One row of white, complete. She counted them once. "Complete." She said nothing else. She capped her pen and left.
School started on day 341. In the morning Nian left the new class schedule behind, taped to the side panel of the music stand, the four corners flattened under clear tape. In the evening I asked her about the essay. "The teacher gave it a Good. Said it was too short." "How short?" "Three words." "Which three?" She hung up her coat. "Not telling." She sat down and practiced, forty minutes, one drink of water in the middle. When she finished she closed the metronome and said, all of a sudden: "The teacher says an ideal needs concrete things." Then she went to bathe. Water fell from her hair onto the corridor floor, one drop, two drops; I followed behind her with a rag, wiping, and by her door the door closed.
Two days later she came home from school and said it while changing shoes at the door: in April the school holds a recital, two from each class. "Oh," I said. "My teacher put me in," she said. She squared the shoes. "Can you come?" "I can." "This time don't sit in the back row." "Where do I sit, then?" "Next to the teacher. There's room." She went into her room and set her schoolbag on the bed, and after a while said: "The practice-room chairs are low. Bring a cushion." "All right." She didn't come out again.
That night I pulled open the middle drawer of the writing desk. The blue plastic-covered notebook was there, under the reading glasses. I turned to the seven lines, read them twice; the eighth line stood empty. The pen was in the drawer too, beside the three batteries—the one that doesn't write. I didn't change pens. I closed the notebook and put it back.
On the night of day 342 the last group finished. Sixty-one keys, one hundred eighty-three variants, and from start to finish only two kinds of receipt: one kind filled most of a page; the other was three lines. Xiao Gao pinned up the final page. "Done." "Done." He put the stapler back in the pen cup and sat looking at the stack a while. "In my whole time on this job, this is the first machine I've ever hoped would report an error." We shut down two machines and left one on. In the corridor the new lights burned steady, one panel after another to the end of the hall.
On the night of day 343 I was home. I laid a sheet of paper under the desk lamp and went through the past days. The candidates' receipts: all F. The verified keys' receipts: all zero. The registry: sixty-one keys. All of it copied in my head; I hadn't needed to take materials home. Two machines, two decodes, byte for byte identical—I had read that night's record three times. The machines made no mistake. The receipts had been saying it all along: in this column there is nothing for a key to meet.
I started over on what a key is. 1987: a line from a drama, spoken aloud by somebody once, and taken in. 2008: 0.9 seconds, happened, taken in. 2021: one ei, happened, taken in. Three keys, three things that had happened. What the column was waiting to meet was a thing that had not happened yet.
Not empty. To be filled.
I wrote it down on the paper, three lines. One: the field structure is complete, every field present. Two: the receipts for the three verified keys are empty codes, not error codes. Three, the judgment: what this column awaits is an event that has not yet happened. On the third line, the first word I set down was "signal." I read it back, crossed it out, and wrote "event." In the living room the Red Lantern was on, shortwave band, static, volume very low. Nian was asleep. I slid the paper into the band log, set the paperweight on it, slept a while, and not soundly.
Next day at the institute I pulled the solver records first and checked them against the paper from the top; they matched; only then did I submit it. Zhou didn't look long. When he finished he didn't raise his head; both hands rested on the desk edge. "When will it happen?" "I don't know." "Can it be computed?" "No." He sat without moving. After a while he said: "I've gone by the schedule my whole life. There is no column for this on the schedule." He stood, took the sheet away to be copied in three, came back, and returned the original. "File it," he said. "Add one line when you file: estimated time of completion, cannot be estimated." He said, "That line is there because I told you to add it. Put my name on it."
I got past Shen Yi at the stairwell. He read it through. "To be filled. Filled by whom?" "Not by us." "When do we learn that it's been filled?" "The day a key goes in." He folded the sheet and put it in his case. "Report once a week, on Mondays." A beat. "Three words will do. Not yet filled."
"All right."
Then he went upstairs. At the turn of the stairs he slowed half a step. He didn't stop.
On Monday Tong added a new column to the duty log and asked me what to write in it. "Not yet filled," I said. He wrote it, his writing smaller than the stamp. When he'd finished: "How long does this column go on?" "I don't know." "Then we'd better lay in two extra logbooks."
The first weekly report went out on a Monday morning. Three words: not yet filled. The receipt came down the same day; the sign-off box carried the DOCUMENT RECEIVED stamp, the date filled in. Zhou copied the three words onto the whiteboard, at the very bottom of his column of the schedule, the writing smaller than anything else on it. At the group meeting someone asked how long the three words were meant to hang there. "Until they don't need to," he said. Then he went on handing out work: Layer 2's inventory moves to the Layer 4 catalog area; first, fix that empty slot in black and white. His voice reading that item differed in no way from his voice reading any other item.
The fourth field's nominal length is sixty-four symbols; I checked that three times. Nominal sixty-four; what decoded was blank. The blank I checked more times than that. On the night of day 346 I pulled the bytes of those sixty-four symbols and looked at their amplitudes one by one. They were not zero. Each symbol's amplitude was one-fortieth of a normal data symbol's—shallow, shallow enough that the demodulator took them for floor and discarded them. The noise floor is ragged: one here, one there. These sixty-four were level. The same few groups, recurring, coming round at intervals. It was on the third pass that I could admit what they were: this wasn't the floor. This was writing set along the floor. Sixty-four symbols, not zero-padding—sixty-four very quiet numbers that had been lying there the whole time.
The machine room had no plotting program, and a plotting program would have needed an approval. I didn't file for one. I drew a stack of graph paper from the storeroom, copied the sixty-four amplitudes into a column, laid out the horizontal axis at two thousand hertz to a square, and plotted the points one at a time. Around the thirtieth-odd point, the line rose. When the plot was done I circled the peak, read the value, and wrote it beside the circle.
7.665 megahertz.
I didn't go on from there. The next night I took a fresh stack of graph paper, laid the horizontal axis again at a thousand hertz to the square, copied again, plotted again. The grid twice as fine, the plotting twice as slow, and the peak stood where it had stood; it hadn't moved. I circled the second peak too and wrote the same number. I laid the two sheets corner to corner. The two lines fell on top of each other.
A superheterodyne receiver leaks a little of its local oscillator, always. Tune to a station, and the local oscillator lands on that station's frequency plus one intermediate frequency, and leaks there, and there is no hiding it. I memorized that the year I sat for my license, and took it for a gimme question. The Red Lantern 741: intermediate frequency 465 kilohertz. With shortwave tuned to 7.2 megahertz, the local oscillator leaks at 7.665.
Ye Zhen came the next morning to return the registry book and saw the graph paper weighted on my desk. She looked a while. "What a narrow line." "What is it?" "Not determined yet." She asked nothing further, gathered the registry book in her arms, and at the door said one more thing: "Narrow is good. A narrow thing—one square has room for it and nothing else."
That evening I took the graph paper home. The band log was under the paperweight. I turned to the page where my father copied out the band table. In the footer, one line of small pencil writing, the characters tiny, the strokes even: 7.2 + 0.465 = 7.665. Under the equation, one more character: leak. I found this page as a child and took the word for the leak in a roof—the house leaked, the radio leaked; everything leaked. Now the line was on the graph paper, the equation in the footer, and the two things met. The line was tall and narrow, narrow as if drawn against a ruler. It wasn't drawn. I traced it: sixty-four points, one at a time.
I folded the graph paper in two and slipped it into the band log, under that line of equation. The covers wouldn't close tight; the paperweight held them. In the living room the Red Lantern went on sounding its static; nothing anywhere on shortwave, the volume very low. It had given the frequency down to the kilohertz digit—no more than that, and not one less. My father wrote the equation in the footer, and after that character, leak, he never wrote anything else on the page. As a child I never asked what the equation was for. There is no one left to ask.
7.665. The key had no sound yet. The day it sounds, the place it sounds is here.