Voices in the Static

If you turn a shortwave radio across the dead spaces of the band, late, you will sometimes find one of them. A carrier hiss, and then a voice — flat, unhurried, often a woman’s, sometimes a child’s, sometimes the ghostly chime of a music box first — reading numbers. Four. Seven. Two. Nine. Four. Seven. Two. Nine. Groups of five, over and over, in German or Spanish or English or a Slavic tongue, with no station name, no explanation, no sign-off that tells you anything. Then silence, or the tone, and the frequency goes back to hissing.

They have been on the air for the better part of a century. They are called number stations, and the open secret of them — never confirmed, never quite deniable — is that they are for spies. A one-time pad, the only truly unbreakable cipher there is, needs no more than this: a fixed frequency, a schedule, and a voice reading digits that mean nothing to anyone without the matching sheet of random numbers. An agent in a foreign city, with a cheap radio and a pad of paper, listens at the appointed hour and copies down the groups and, alone, turns them into a sentence. No wire to tap. No account to subpoena. Nothing to trace back but a voice anyone can hear and no one else can read.

What holds me about them is not the espionage. It is the shape of the thing: a transmission flung out to almost everyone and meant for almost no one. The signal crosses whole continents. Anyone with the right receiver, in a dozen countries, can tune to that flat voice reading its fours and sevens — and for all of them but one, it is pure noise, a number with no referent, a message addressed to a person they will never meet and cannot identify and may not even share a hemisphere with. All that reach, all that power pushed into the ionosphere and bounced back down over an ocean, to say one private thing to one hidden listener while the rest of the world overhears and understands nothing.

My grandfather kept a radio he was always tuning, and I think of these stations as the far side of what he was doing. He turned the dial hoping to be reached — the shipping forecast, a football result, a voice from somewhere far off arriving in his kitchen to keep him company. The number stations are the opposite motion. They transmit without wanting to be received, by anyone save the one. They are broadcast as concealment. The voice goes out precisely so that the meaning can stay hidden, the openness of the signal serving the total privacy of the message. Radio used as a way of speaking to one person in a room full of the whole world, and being certain no one else can listen in, because listening in gets you nothing at all.

Many of them went quiet when the Cold War thawed. Some did not. You can still find them, humming their patient digits into the dark, and no one has ever fully explained why the ones still broadcasting go on, or who is still copying them down in some rented room, or whether anyone is at all — whether a few of them now transmit to no one, out of habit or caution or a schedule nobody thought to cancel, a flat voice reading random numbers to an agent long since dead or defected or grown old and forgotten.

That is the image I cannot shake. Somewhere tonight a carrier opens, and the tone sounds, and the voice begins — three, eight, one, one, five — steady, indifferent, filling a slice of the shortwave band with a meaning that belongs to exactly one person, if to anyone, while everyone else who happens to be listening hears only the numbers, and the hiss, and the strange cold company of a signal not meant for them.