The world's worst nuclear energy disaster took place at Chernobyl nuclear power plant in Pripyat, Ukraine back in 1986, and its effects are still being felt today. A 30-km (19-mile) exclusion zone is ...

Forty years after the Chernobyl disaster, those who helped contain its aftermath, known as liquidators, recall a silent, relentless battle against radiation, an enemy they could neither see nor fight.