Comment by Vecr

Yeah, I don't know. Gwern thinks it would work if done near perfectly, but in practice what gets done is freezing dead bodies in an already pretty much unrecoverable state (if not already dead and warm for hours if not days), with no precautions (or only "feel good" non-functioning precautions) against microscopic ice spike formation, and then at some point someone screws something up and you get a temperature excursion and then there's nothing left information recovery wise. I don't agree with Gwern that current techniques would work even in theory.