The Zone of Silence: Mexico's Radio Dead Zone

Somewhere out in the Mapimi basin, a guide promises, there is a line you can cross where your radio simply dies. What actually happens when you cross it is quieter: the desert stays exactly as loud, or as silent, as any other stretch of scrub, and the dial keeps working.

A missile, a legend, and a name

The Zone of Silence, the Zona del Silencio, is a patch of the Mapimi desert where the states of Durango, Chihuahua and Coahuila meet, deep in an arid basin called the Bolson de Mapimi. Its reputation is that electromagnetic signals fail there: radios go dead, compasses spin, television will not resolve, and the sky fills with lights. Around that core cluster the usual accessories — meteorites that supposedly rain down more thickly here than anywhere else, mutant plants, oversized tortoises, and visiting UFOs.

The legend crystallised around a real event. In July 1970 an American Athena test missile launched from Green River, Utah, strayed wildly off course and came down in the Mapimi desert, carrying small amounts of radioactive cobalt-57. The United States quietly sent teams to recover the debris, even reportedly building a rail spur to haul out contaminated soil, and the sight of Americans combing the desert for something fallen from the sky did for Mexico roughly what a weather-balloon recovery did for Roswell.

What testing actually finds

Held up to instruments, the marquee claims dissolve. Journalists and scientists who have driven into the zone with radios have generally found them working perfectly well; there is no documented, reproducible magnetic anomaly that kills electronics across the area. The famous meteorite abundance has a flat, boring cause: the Bolson de Mapimi is open, pale desert with little vegetation, so dark meteorites are simply easier to spot and collect there than in a forest, not more numerous.

The "strange" flora and fauna are largely the ordinary endemic life of a biosphere reserve — Mapimi is protected precisely because its desert ecology is distinctive — reframed as sinister once the legend gave people a reason to look twice.

The residue in the basin

The tidy version is convincing, and most of the Zone of Silence is a marketing triumph draped over a normal desert and one Cold War accident. It even inherited the numerology, with promoters claiming it sits at a latitude that lines it up with the Bermuda Triangle and the Egyptian pyramids, which is the sort of pattern the human mind manufactures for free.

What lingers is smaller and older than the missile. Local ranchers spoke of radio trouble and odd lights before 1970 — the aviator Francisco Sarabia reportedly complained of interference over the area back in the 1930s — and the people who actually live in the Bolson have their own quiet catalogue of nights that did not behave. A dead desert basin is a good place to see too much sky, and to wonder.

Below, readers have filed their own accounts of dead signals, wrong compasses and desert lights, and voted them True, Fake or Not sure. Test the legend against the missile and cast your verdict.