What were some of the gruesome experiments that were done with the people in concentration camps?

In concentration camps during World War II, particularly those run by the Nazis, horrific experiments were conducted on inmates without their consent. These included forced sterilizations, exposure to extreme temperatures, and testing of chemical and biological weapons. Some subjects were subjected to surgical procedures without anesthesia, while others were used to study the effects of Infectious Diseases. These experiments aimed to further the Nazi ideology and medical knowledge, often resulting in severe suffering and death for the victims.