Felix Baumgartner, 42, termed it a mission to the "death zone" and said he will be doomed if his world record bid goes wrong.
The Austrian plans to jump unaided by machine from a height of 120,000 feet from a giant balloon over New Mexico, US, this August.
Image: A file photo provided by Red Bull shows extreme sportsman Felix Baumgartner jumping from a helicopter to land by parachute on Scandinavia's highest residential building, Turning Torso, seen at bottom right, in Malmo, Sweden. The official website of Red Bull announced Feb. 7, 2012 that Daredevil adventurer Baumgartner and the Red Bull Stratos team are headed to Roswell for the final planning on a 23-mile plunge from outer space. (Image courtesy: AP)