Radical gravity control experiments could let spies see through walls and even lead to new ways to fly

As part of one of the research projects, scientists at the Ministry of Defence claim they have made a breakthrough in creating a new 'quantum gravity detector'. 

The gravity scanner can detect tiny changes in gravity, by using lasers to freeze atoms in position, a BBC Horizon documentary has revealed. 

It then measures how these atoms are affected by the gravitational pull of objects to see if there is anything behind a solid wall or deep underground. 

Similar quantum research into detecting and controlling gravity has been going on for decades. 

The documentary also discusses how in the late 1980s, aerospace engineer Dr Ron Evans (inset) went to his bosses at BAE Systems and asked if they'd let him attempt to control gravity. 

Dubbed Project Greenglow, it was wound up in 2005.