The Archivist worked nights. He had worked days, too, for a while, but the daytime sounds were the wrong ones: coffee machines, the sigh of a bus kneeling at a curb, a man on the corner saying hello, hello into a phone that was not on. The daytime sounds were too sure of themselves. He needed sounds that did not know they were being heard.
His office was on the eleventh floor of a building that had been a hotel and then a bank and then nothing for fourteen years. The room had been a typing pool once. There were still ghost rectangles on the floor where the desks had been. The Archivist had pushed all of them to the walls and put his own desk in the center, where the afternoon light, when there was any, used to fall.
He cataloged sounds for the city. The city had hired him in the last budget cycle of an old administration and forgotten about him in the first budget cycle of a new one. Nobody asked for his reports. Nobody read them. He filed them anyway, in green folders, in the cabinet, in alphabetical order, by year, by district.
What he heard, he heard with two microphones: one on the eleventh floor windowsill and one on the roof, taped to a rusted weather vane that had stopped pointing in any direction in particular. The microphones fed into a tape machine the city had bought him. The tape machine recorded onto reels the city had stopped buying him in 2019. He had fourteen reels left.
A city forgets how to listen one street at a time. You can mark the streets on a map.
Tonight there was a sound he did not recognize. It had been there for six minutes, somewhere around the river, low, lower than a truck. Lower than a freight. Lower than the bridge ought to be able to make. He listened to the playback three times. He wrote it down on the intake form. He filed it in the green folder for May.
He did not write the part of the form where you describe what you think the sound is. He never wrote that part. The Archivist had a rule, describe what is there, not what you think is there, and he had kept it for thirty-one years.
He turned off the lamp. He left the tape machine running. The city, below him, was sleeping in the way only a city sleeps, which is to say, not at all.
The sound came again at 4:17.