The final conclusion from the Soviet investigations was that the bodies found in the Reich chancellery garden were not the bodies of Hitler and Braun, based on the evidence of witnesses and the best forensics available at the time. This was suppressed because it had already been announced that they were and the Soviet authorities did not admit to being wrong. The remains were deliberately destroyed by the KGB years later, once it became possible to do more comprehensive testing on them. Dug up from the secret hole they'd been buried in, incinerated and scattered into a river in the 1970s. With no reason given. The historian concludes that the most likely explanation is that when a few Hitler loyalists in the bunker realised that they couldn't thoroughly destroy the bodies with the limited cremation available to them (it's hard to completely burn a body) they buried them somewhere else and substituted two other partially burned bodies for the Soviets to find. There were a lot of corpses around and they had more than enough time and they didn't want the Soviets to get hold of Hitler's remains.