Tens of thousands of Jews held in the eastern territories were marched towards the heart of Germany so they could not bear witness to the Allies. Aware that the world had been alerted to the horrors of the camps, the Nazis sought to destroy evidence. In June, Soviet forces liberated the first major camp, known as Majdanek, in Lublin, Poland. The Nazis had burned down the crematorium chimney but had failed to destroy the gas chambers and barracks. Only a few hundred inmates were still alive.
Medical experiments conducted on camp inmates by the SS were another distinctive feature.[51] At least 7,000 prisoners were subjected to experiments; most died as a result, during the experiments or later.[52] Twenty-three senior physicians and other medical personnel were charged at Nuremberg, after the war, with crimes against humanity. They included the head of the German Red Cross, tenured professors, clinic directors, and biomedical researchers.[53] Experiments took place at Auschwitz, Buchenwald, Dachau, Natzweiler-Struthof, Neuengamme, Ravensbrück, Sachsenhausen, and elsewhere. Some dealt with sterilization of men and women, the treatment of war wounds, ways to counteract chemical weapons, research into new vaccines and drugs, and the survival of harsh conditions.[52]
On April 28, 1945, the day before the liberation of the camp, Dachau citizens joined with escaped prisoners from the camp in an uprising led by Georg Scherer, a former prisoner who had been released, but was still working in a factory at the Dachau complex. Their attempt to take control of the town of Dachau failed; 3 of the prisoners and 4 of the locals were killed in a battle that took place in front of the Dachau town hall. Georg Scherer survived and later became the mayor of Dachau.

You see, when Bergen-Belsen was liberated these people were let loose. So we were wandering. We were wandering from one place to another. And there were warehouses. We came to a building, and we walked in, and I still see rows and rows and shelves of handbags, ladies' handbags. As we were walking over there to reach those shelves, I sort of stepped on something. And I said to my friend, "Look! There's a body!" You see, somebody, one of these inmates who wandered to these warehouses and dropped dead from exhaustion or something. And she says, "What do you want me to do about it?" I said, "Let's carry it out." She said, "Are you crazy? You can't carry that out." and she took a few packages of these linens and dropped it on (the body). And then we went to the shelves, and she wanted a handbag. And I wasn't in the mood anymore for the handbag. She pulled out one handbag. It was an alligator handbag. She says, "Take this one." I took it, and she took another one, and we walked out. And I remember, as we left the place, I just threw back the bag. I said, "I don't want it." - and walked away. And this only came back. I never thought about it.
The Nazis also used Dachau prisoners as subjects in brutal medical experiments. For example, inmates were obligated to be guinea pigs in a series of tests to determine the feasibility of reviving individuals immersed in freezing water. For hours at a time, prisoners were forcibly submerged in tanks filled with ice water. Some prisoners died during the process.

Established in March 1933, Dachau was the first Nazi concentration camp.12 The camp originally housed political prisoners and those opposed to the Nazi regime. Individuals and groups who were considered inferior to Germans, such as Jehovah Witnesses, Gypsies and homosexuals were sent to Dachau. The first Jews imprisoned at Dachau were sent there because they were considered enemies of the Reich.13 Over time, more Jews were sent to Dachau than any other group.
In April 1943, a part of the Bergen-Belsen camp was taken over by the SS Economic-Administration Main Office (SS Wirtschafts-Verwaltungshauptamt; WVHA). It thus became part of the concentration camp system, run by the SS Schutzstaffel but it was a special case.[7] Having initially been designated a Zivilinterniertenlager ("civilian internment camp"), in June 1943 it was redesignated Aufenthaltslager ("holding camp"), since the Geneva Conventions stipulated that the former type of facility must be open to inspection by international committees.[8] This "holding camp" or "exchange camp" was for Jews who were intended to be exchanged for German civilians interned in other countries, or for hard currency.[9] The SS divided this camp into subsections for individual groups (the "Hungarian camp", the "special camp" for Polish Jews, the "neutrals camp" for citizens of neutral countries and the "Star camp" for Dutch Jews). Between the summer of 1943 and December 1944 at least 14,600 Jews, including 2,750 children and minors were transported to the Bergen-Belsen "holding" or exchange camp.[10]:160 Inmates were made to work, many of them in the "shoe commando" which salvaged usable pieces of leather from shoes collected and brought to the camp from all over Germany and occupied Europe. In general the prisoners of this part of the camp were treated less harshly than some other classes of Bergen-Belsen prisoner until fairly late in the war, due to their perceived potential exchange value.[9] However, only around 2,560 Jewish prisoners were ever actually released from Bergen-Belsen and allowed to leave Germany.[9]