Relying on remote data, including photographs taken after the flight, the investigators believe that “navigation errors created high horizontal velocities at touchdown,” which most likely resulted in Ingenuity experiencing a “hard impact on the sand ripple’s slope,” causing it to pitch and roll.

"When running an accident investigation from 100 million miles away, you don't have any black boxes!" NASA's Håvard Grip said.

The first aircraft to achieve a powered, controlled flight on another planet, NASA’s Ingenuity helicopter, crashed on Mars 11 months ago when its navigation system became befuddled by a bland, featureless stretch of terrain and slammed so hard into the Martian surface that the tips of its rotor blades snapped.