NASA's much-hyped EM Drive – often described as a 'Warp Drive' – made shockwaves around the world, with a propulsion system which seems to defy the laws of physics. But now China has claimed that it has its own version – and it's already working. A video put out by a Chinese propaganda channel claims that Chinese scientists have a working prototype – something NASA has failed to achieve. The video claims that a working drive has been developed by CAST scientist Dr Chen Yue at China's space agency. The engine works by bouncing microwaves around inside an enclosed container – and could revolutionise space travel, allowing spaceships to reach Mars in weeks. The engine has no exhaust, and would outperform any current booster used in space – and NASA tests showed 'surprising results' last year. Last year, a team from the China Academy of Space Technology said that NASA's results 're-confirm' their own work – and plan to use the drive in satellites 'as quickly as possible'. If the EM drive