was netaji subhash chandra bose died of flight accident or else?

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netaji subhash chandra bose was one of the great freedom fighter india will remembering always for his brave, leadreship, and fighting spirit. it was believed that he was died in a flight accident. but it is mystery till now. whether he died or not. is there any ans to this? there are people who argues. but is there any one who know the truth?. many believed that he still lived for many years. if he lived then why not he came in public? dont he like independent india? or is that we tell about him to defamous him? he is the god father for many martiyres.