It was all pure slave labor, the idea was to work them to death and produce armaments such as V2s.
Even though there was sabotage, it more or les worked.
Wasn’t Dachau the model prison camp the Germans used as a show and film them having a pretty good life for the Red Cross?
You're thinking of Thereisienstadt, which was located in Czechoslovakia.
That was Theriesenstadt, the so-called ‘paradise ghetto’.