It's a Doomsday plan for what happens if a prolonged power outage or a disaster hits the UK, and it comes amid recent odd announcements in the country about being ready for an emergency. 

It almost sounds like a crackpot notion, except this one is coming from the BBC. It arrives as many people abandon their radios in favour of online listening. 

"A contingency radio studio, dubbed Black Sky, will be able to operate without internet in case of widespread outage. The project is so secretive that only a small number of people know the exact details, although some 100 people would run the studio, which would be stocked with food and essential supplies needed to get through a crisis.

Tanks of between five and 40,000 litres of diesel would be used to power generators to keep broadcasters on air using FM radio, with staff given satellite phones in order to stay in touch, the BBC reported."

What happens if a ‘Black Sky’ attack hits the UK?