When a tsunami triggered the explosion at the Fukushima nuclear plant in 2011, the world feared the worst and for good reason. It is the most devastating nuclear disaster since Chernobyl. Tens of thousands of people were forced to leave their homes and millions of others now live in fear of serious illness. Radiation is everywhere – in the soil, trees, food, air and water. The Japanese are trying to clean it up, but they’re fighting a losing battle. This Sunday, Liz Hayes goes inside the exclusion zone to the ghost cities, deserted and abandoned, never to be lived in again. And 60 Minutes will also broadcast a warning from one of Australia’s leading medical and nuclear experts, who says the 2020 Tokyo Olympics should be cancelled, due to radiation contamination.