1) Extraction of a tooth on a live human (without anesthetics) to analyse on how a healthy human can bear the most extreme pain.

2) Exchange of human blood with horse/dog/pig blood to see if a normal human being can survive using animal blood

3) Deliberately feed the Chinese with bread and dry biscuits, and thereafter provide zero water/fluids to see how long the person can survive without water until he/she dies

4) Exchange of limbs between human under a non-anesthetics surgery to see if the limbs can be reconnected again

5) Experiment of high ultra frequency sound on a normal healthy human to see if he/she can survive under which sound hertz

6) Live extraction of human organs + live skinning

7) Uses live human to train Japanese army to see on which part of a human body can result in death instantly on one hit or on one punch

Many many more experiments.