Russia's nuclear industry has a past shrouded in Soviet secrecy.
In the last 60 years it is thought tens of thousands of people have been forced from their homes after radioactive waste was dumped into a river in Siberia.
The government recently announced the resettlement programme was over. However, four villages remain in the deadly radiation zone.
Al Jazeera's Charles Stratford travelled to the Chilyabinsk region of South West Siberia. This is what he found.
