https://cdnph.upi.com/ph/st/th/5161786523141/2026/upi_com/7dd788bf42dc11507b78429ee3ab7a6f/v1.5/Fastest-man-on-land-pushes-hydrogen-car-to-record-406-mph-in-Utah-desert.jpg" /> A retired Royal Air Force fighter pilot, the only person to break the sound barrier on land, set a world land speed record for a hydrogen-powered car.