The growing crisis at Fukushima nuclear plant in Japan is at its most dangerous point since the reactor cores melted down in 2011.
Japan’s nuclear energy watchdog raised its official “incident level” last week.
Cooling Fukushima’s melted down reactor cores requires an extra 400 tonnes of water every day. This water becomes dangerously radioactive, and has to be stored in a growing number of huge tanks.
Over the last month these tanks have been revealed to be leaking.
Fukushima’s owner, the Tokyo Electric Power Company (Tepco), admitted to a 300 tonne leak. Shunichi Tanaka, chair of Japan’s nuclear authority, fears there are more.
And experts say the leaking is far worse than either Tepco or the government admits.
The deadly water can seep into the groundwater and then the ocean, and contaminate water and food around the world.