In 2014, five-year-old Ashya King's parents were arrested. Unwilling to accept their son's brain tumour was incurable, they took him to Europe - against doctors' advice - for proton beam therapy. In this treatment, high-energy protons travel at two-thirds the speed of light through a patient's body - at millimetre precision. It can transform treatment for children with inoperable cancers. But bringing it to the UK needs a £250 million investment and one of the world's best facilities: a nuclear bunker with six-metre-thick walls to house radioactive equipment. Nearly 2,000 tonnes of kit squeezed into a space the size of four jumbo jets - right under the streets of London and Manchester. Horizon goes behind the scenes of a super-sized engineering challenge
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