 What would you think if I told you that radioactive waste had leaked for nine months? Well that's exactly what happened at the Sellafield's thermal oxide reprocessing facility, which is around here in a map. On the 20th of April 2005, the Sellafield site was discovered to be leaking highly radioactive liquor, which contained 20 metric tons of uranium and around 160 kilograms of plutonium. The leak occurred through a fractured pipe and began filling up the stainless steel chamber. Thankfully, the cell was designed to withstand a leak, which meant there was no radiation leaked into the environment. The incident was classified as both a human and engineering error. It was discovered workers hadn't responded to indicator warnings, but hinted at a failed pipe. The liquor was returned to its primary containment several months after its discovery, which wasn't itself nine months after the deadly fluid had started freely flowing out of the leaking pipe. I wonder if there's any more undetected incidents like this, or could there even be one happening somewhere in the world right now?