By JOHN GREENWALD
May 12, 1986 – TIME Magazine
The first warning came in Sweden. At 9 a.m. on Monday, April 28, technicians at the Forsmark Nuclear Power Plant, 60 miles north of Stockholm, noticed disturbing signals blipping across their computer screens. Those signals revealed abnormally high levels of radiation, a sure sign of serious trouble. At first suspecting difficulties in their own reactors, the engineers searched frantically for a leak. When they found nothing, they lined up some 600 workers at the plant and tested them with a Geiger counter. This time the signals were even more alarming: the workers' clothing gave off radiation far above contamination levels. Outside, monitors took Geiger counter readings of the soil and greenery surrounding the plant. The result showed four to five times the normal amount of radioactive emissions. Clearly, something was wrong -- terribly wrong.
Farther to the north and east, rain and gentle spring snow was falling over parts of Finland and Sweden. From there, as well as from points south and west, from Norway and Denmark, came the same disquieting signals. Somewhere, some mysterious source was spewing dangerous radiation into the atmosphere, into the air that people and plants were breathing. By now thoroughly frightened, the Swedes quickly confirmed that the source was not in their country. They immediately turned their suspicions southward, to their powerful neighbor, the Soviet Union.
A glance at prevailing wind patterns confirmed their fear. For several days, currents of air had been whipping up from the Black Sea, across the Ukraine, over the Baltic and into Scandinavia. But when the Swedes and their neighbors demanded an explanation from Moscow, they were met by denials and stony silence. For six hours, as officials throughout Scandinavia insisted that something was dangerously amiss, the Soviets steadfastly maintained that nothing untoward had happened.
Finally, at 9:00 p.m.