To be aired on BBC Four on the 10th August at 9pm, the documentary will see nuclear physicist Jim Al-Khalili go behind the heavily guarded gates to tell the story of Sellafield and the wider nuclear industry.

The cameras were invited by Sellafield Ltd into some of the country’s most secret buildings in the hopes of increasing public understanding of the site, its challenges and the progress being made.

Darren Ennis, Head of media relations at Sellafield Ltd said: “This documentary is a fantastic opportunity for us to tell a positive story about what happens behind the fence at Sellafield and showcase the people who are taking on one of the most complex and diverse nuclear legacies in the world.

“As you can imagine with a nuclear site like Sellafield, we have a number of strict rules, regulations and security procedures which we had to navigate before we could even begin filming. Thanks to the cooperation of the BBC, the Nuclear Decommissioning Authority (NDA), and parts of Government such as the Department of Energy and Climate Change (DECC), we have been able to make this historic, access all areas programme which will be a first for Sellafield and the industry as a whole.

Mr Ennis added: “I welled up with pride upon previewing the programme and I believe our workforce and wider West Cumbrian community will have the same reaction when they watch it.

“This is a chance for Sellafield Ltd and the wider nuclear industry to showcase itself and also a chance for West Cumbria to put itself on the map. This is the time to tell our story.”

Presenter Jim Al-Khalili and the camera crew spent a month in West Cumbria filming the programme. Jim said: “As a nuclear physicist, I found gaining such amazing access to somewhere as huge and important as Sellafield a once-in-a-lifetime opportunity.

“Little is known about Britain’s nuclear industry so it’s no wonder that the general public have tended to be so suspicious of it, sometimes with good reason. So telling the story of Britain’s nuclear history, both the past failures and the recent successes, is vital.”

As well as looking at the experiments, technology and science behind the nuclear site, the programme will uncover Sellafield’s early history from the rush to develop nuclear weapons and power to the Windscale fire in 1957.