Russia explosion: a nuclear mystery lingers after a deadly mishap – CNN

According to the official account, the elite scientists killed in the accident — Alexey Vyushin, Yevgeny Koratayev, Vyacheslav Lipshev, Sergey Pichugin and Vladislav Yanovsky — were killed during tests on a liquid propulsion system involving isotopes. Sarov, known during the Cold War as Arzamas-16, is one of Russia’s secret cities. Closed to foreigners and accessible …