- In January of 1942 mass killings of Jews using Zyklon-B began at Auschwitz-Birkenau in Bunker I (a red farmhouse) in Birkenau. The bodies were buried in mass graves in a meadow nearby.
- In July 1942 Treblinka extermination camp opened in Poland. The camp consisted of two buildings with 10 gas chambers, which each held 200 people. Carbon monoxide gas was used but later replaced with Zyklon-B. Bodies were burned in open pits.
- September of 1942 open pit burning bodies begins at Auschwitz in place of burial. They made the decision to dig up all 107,000 corpses, to prevent fouling ground water.
- October of 1942 Jews were transported from Norway to Auschwitz.
- December of 1942 sterilization experiments on women at Birkenau began.
- The number if Jews killed by SS Einsatzgruppen passes one million.
- Nazis used slave laborers to dig up and burn bodies to remove all traces.
- April of 1943 new gas chambers/ crematory V opened in Auschwitz
- Jews in Rome were rounded up with over 1,000 sent to Auschwitz
- In December of 1943 the chief surgeon at Auschwitz reported that 106 castration operations have been performed.