Blackbox

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I believe everyone knows what is the use of a 'blackbox' in a plane right? For those who don't, let me explain it swiftly. 'Blacbox' is used to record the flight's record such as its altitude record and the pressure level inside the plane. It is especially useful for flight crash investigator to investigate the flight status shortly before crash. My question is, if the 'Blackbox' is never damaged during the crash, why isn't a whole plane made out of that stuff?