The japanese experiments on human beings were just as bad or worse: body part swaps, person merging, survival time studies for various death scenarios, there was a lot of extremely messed up stuff.
it (experiment information) "could never have been
obtained in the United States because of scruples
attached to experiments on humans," and "the information
was obtained fairly cheaply."https://www.independent.co.uk/news/world/asia/china-xinjiang...
https://www.thedailybeast.com/china-forcing-experimental-cor...