Radioactive decontamination work far behind schedule in Fukushima
Fukushima nuclear disaster
Cesium hotspots found in seabed east of Fukushima
Waterborne radioactive levels in Fukushima plant pit unchanged from 2011
Radioactivity levels in Fukushima groundwater increase 47-fold over 5 days
THEN AND NOW: Photos compare changes in disaster zone
INSIGHT: Japan's nuclear clean-up costly, complex and at risk of failing