On April 6, 1993, a Russian nuclear reprocessing site in Siberia known as Tomsk-7 caught fire after an underground tank exploded, sending up a radioactive cloud. The reactor was believed to have been involved in the production of weapons-grade nuclear fuel, but authorities kept a tight lid on the release of information about the accident. The number of casualties is unknown. Despite the end of the Cold War, the area remains closed to non-residents, and visitors must present entry documents at checkpoints.
August 21, 2013 12:39 PM PDT
Photo by: city of Seversk official website
| Caption by: Charles Cooper
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