Sceptics still wrote off the results as experimental errors, until Nasa’s Eagleworks lab itself claimed to have measured thrust from the drive. Paul March, an engineer at Nasa, said: “We first built and installed a second-generation, closed–face magnetic damper that reduced the stray magnetic fields in the vacuum chamber by at least an order of magnitude and any Lorentz force interactions it could produce. And yet the anomalous thrust signals remain.” Previously, Nasa researchers had said that the drive is “producing a force that is not attributable to any classical electromagnetic phenomenon”.