In 1942, a network of auxiliary camps was created at Dachau, their prisoners being used above all for slave labour in the German weapons industry. Up to 37 000 people were imprisoned in Dachau. Underground factories were created at the largest complex of auxiliary camps at Landsberg am Lech, with mostly Jewish prisoners being deported from the camps in the east to help build them. In late 1944 and early 1945, some 30 000 prisoners worked there under deadly conditions.
The number of prisoners incarcerated in Dachau between 1933 and 1945 exceeded 188,000. The number of prisoners who died in the camp and the subcamps between January 1940 and May 1945 was at least 28,000, to which must be added those who perished there between 1933 and the end of 1939, as well as an uncounted number of unregistered prisoners. It is unlikely that the total number of victims who died in Dachau will ever be known.

Many healthy, young strong Jews were not killed immediately. The Germans' war effort and the “Final Solution” required a great deal of manpower, so the Germans reserved large pools of Jews for slave labor. These people, imprisoned in concentration and labor camps, were forced to work in German munitions and other factories, such as I.G. Farben and Krupps, and wherever the Nazis needed laborers. They were worked from dawn until dark without adequate food and shelter. Thousands perished, literally worked to death by the Germans and their collaborators.
The 15 men present at Wannsee included Adolf Eichmann (head of Jewish affairs for the RSHA and the man who organized the deportation of Jews), Heinrich Müller (head of the Gestapo), and other party leaders and department heads.[256] Thirty copies of the minutes were made. Copy no. 16 was found by American prosecutors in March 1947 in a German Foreign Office folder.[263] Written by Eichmann and stamped "Top Secret", the minutes were written in "euphemistic language" on Heydrich's instructions, according to Eichmann's later testimony.[264] The conference had several purposes. Discussing plans for a "final solution to the Jewish question" ("Endlösung der Judenfrage"), and a "final solution to the Jewish question in Europe" ("Endlösung der europäischen Judenfrage"),[256] it was intended to share information and responsibility, coordinate efforts and policies ("Parallelisierung der Linienführung"), and ensure that authority rested with Heydrich. There was also discussion about whether to include the German Mischlinge (half-Jews).[265] Heydrich told the meeting: "Another possible solution of the problem has now taken the place of emigration, i.e. the evacuation of the Jews to the East, provided that the Fuehrer gives the appropriate approval in advance."[256] He continued:
In 1935 the Wehrmacht began to build a large military complex close to the village of Belsen, a part of the town of Bergen, in what was then the Province of Hanover.[1] This became the largest military training area in Germany of the time and was used for armoured vehicle training.[1] The barracks were finished in 1937. The camp has been in continuous operation since then and is today known as Bergen-Hohne Training Area. It is used by the NATO armed forces.