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For Felix Baumgartner to skydive from higher than anyone has ever dared he must also do something no human has ever done: free-fall though the sound barrier. In a computer animation it looks straightforward enough, but the reality is no one knows if this is possible. To be able to go supersonic Felix will have to break through the transonic wall, at this moment some parts of his body begin to go supersonic while other parts remain sub-sonic. This could cause violent vibrations which could damage his organs or even kill him.