On April 26, 1986, Soviet engineers at the Chernobyl nuclear power plant were conducting a safety test. Doomed by a fatal design flaw and pushed to the limit by human negligence, reactor 4 exploded amid an attempted shutdown during a routine procedure, setting off a chain of events that ultimately released radioactive material hundreds of times greater than that of the atomic bomb dropped on Hiroshima.

Although the accident occurred north of Kyiv, Ukraine, near the border with Belarus, radioactive fallout was soon detected throughout northern and central Europe. Yet the Soviets did what they could to prevent the spread of information that would reveal the true horror of what had occurred.

For decades, researchers, political leaders and advocacy groups have worked to uncover the story of the explosion. While science has allowed us to understand the circumstances of the explosion itself, it has taken much more work to uncover the layers of mismanagement, negligence and misinformation that resulted in human suffering, ecological disaster and economic damage.

One of the problems is that many of the official Soviet records of the event, such as the KGB files, are located in Moscow and are inaccessible to all but a few Russian government agencies.

But there is a partial workaround: Because East Germany was a Soviet satellite state and not a full member of the Soviet Union, official documents remained in the country after the fall of the Berlin Wall. In 1991, after the reunification of Germany, the German government passed a law allowing for the declassification of certain files from the Stasi, East Germany’s secret police and intelligence service. These files can now give us further insight into the mismanagement of Chernobyl, since the East German Stasi and the Soviet KGB were in communication on the matter.

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