Lying on the remote north west coast of England is one of the most secret places in the country. 65 years ago it helped make Britain a world superpower and within it’s is material that could devastate life on this island and beyond, this is Sellafield. Costing around 2 billion pounds every year, its the most controversial nuclear facility in Britain.

Nuclear physicist Jim Al-Khalili has been fascinated by Sellafield for much of his career, having heard stories of extraordinary experiments, the jaw-dropping machinery and the incredibly costly science but their has also been problems, risks and controversies. Now of the first time Sellafield is opening it’s doors to the media, giving the BBC exclusive access to discover the real story.