13:35 Mar. 23, 2016
World's largest aircraft to be launched
It's hard to imagine keeping secrets about an aircraft so spectacularly huge that the Guinness Book of Records is believed to be just days away from rubber-stamping its entry.
But until the vast new Airlander 10 airship was unveiled fully assembled in a giant hangar north of London on March 21, it still had a few to reveal.
"Last time I flew this in 2012," says test pilot David Burns, gesturing at the cockpit controls of the aircraft he'll soon take to the skies in its latest incarnation, "no one was allowed to take photographs of this."
The controls are not entirely different from those of an ordinary plane but include extra switches and gauges that govern gigantic balloons pumped full of helium.
Back in 2012, they were secret thanks to the aircraft's previous life as a U.S. military project that was grounded due to defense cuts.
After further development, it's now literally back afloat.