>>510469659
About 10k mentally ill criminals were killed between February and October 1940 in one of the most efficient dedicated gas chambers the germans had built.

Of course, germans being germans they documented the process with names and reasoning for the killing. Very few of these 10k were jewish. Getting to 140k deaths with six of these in two years was hard for them to achieve. Official tales of millions gassed are hard to explain from a technical standpoint, especially since the six official centers closed down in 1941