In June 1933, Theodor Eicke became the camp commander. He introduced a regime which essentially consisted of the systematic terrorisation of prisoners and an attempt to humiliate them as thoroughly as possible. Eicke had the camp surrounded by an electric fence with watch towers. Dachau also became a „murder school“ for SS members. In 1934, Eicke became the inspector of all the concentration camps. The system he developed was introduced, with certain modifications, into the other camps.
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.
As the first major camp to be liberated by the allies, the event received a lot of press coverage and the world saw the horrors of the Holocaust. Sixty-thousand prisoners were present at the time of liberation. Afterward, about 500 people died daily of starvation and typhus, reaching nearly 14,000. Mass graves were made to hold the thousands of corpses of those who perished.
Uprisings broke out in some extermination camps. The few remaining Jews kept alive to dispose of bodies and sort possessions realised the number of transportees was reducing and they would be next. Civilian uprisings occurred across Poland as mainly young Jews, whose families had already been murdered, began to resist Nazi oppression. With reports of rebellion and mass murder in the British press, the situation in the camps could no longer be be ignored.
The camp was liberated on April 15, 1945, by the British 11th Armoured Division. The soldiers discovered approximately 60,000 prisoners inside, most of them half-starved and seriously ill, and another 13,000 corpses, including those of Anne and Margot Frank, lying around the camp unburied. The horrors of the camp, documented on film and in pictures, made the name "Belsen" emblematic of Nazi crimes in general for public opinion in many countries in the immediate post-1945 period. Today, there is a memorial with an exhibition hall at the site.