In April 1940, Rudolph Höss, who become the first commandant, identified the Silesian town of Oswiecim as a possible site for a concentration camp. The function of the camp was initially to intimidate Poles and prevent resistance to German rule. It was also perceived as a cornerstone of the policy to re-colonize Upper Silesia, which had once been a German region, with 'pure Aryans'. On April 27th, Himmler ordered construction of the camp.
In late 1944, Plaszow and all its sub-camps had to be evacuated in face of the Russian advance. Most of the camp inmates—more than 20,000 men, women, and children—were sent to extermination camps. On receiving the order to evacuate, Schindler, who had approached the appropriate section in the Supreme Command of the Army (OKW), managed to obtain official authorization to continue production in a factory that he and his wife had set up in Brünnlitz, in their native Sudetenland. The entire work force from Zablocie—to which were furtively added many new names from the Plaszow camp—was supposed to move to the new factory site. However, instead of being brought to Brünnlitz, the 800 men—among them 700 Jews—and  the 300 women on Schindler’s list were diverted to Gross-Rosen and to Auschwitz, respectively.

Really, this is the most horrifying part of any visit to Auschwitz-Birkenau. I had been to see Auschwitz I twice before, but only last month had the opportunity to visit the horrific 'sister camp' of Birkenau (also called Auschwitz II) The scale of the evil is what is most terrifying. Climb the lookout tower of the main entrance building and you will see the enormity of the crime. You can even see where future death dormitories were planned. It is an abbatoir for humans on an industrial scale. Everyone must see this - and pray it never happens again.

When a train carrying Jewish prisoners arrived “selections” would be conducted on the railroad platform, or ramp. Newly arrived persons classified by the SS physicians as unfit for labor were sent to the gas chambers: these included the ill, the elderly, pregnant women and children. In most cases, 70-75% of each transport was sent to immediate death. These people were not entered in the camp records; that is, they received no serial numbers and were not registered, and this is why it is possible only to estimate the total number of victims.
Such a stalemate is not unique to armed conflict. Businesses can find themselves in similar situations when the status quo is preserved through a lack of innovation that seems to plague all competitors. It’s very hard to spot this situation in the consumer tech industry, but it happens a lot in heavily regulated industries like healthcare and education. If we were to teleport people from just ten years ago to the present day, they would hardly recognize all the tech companies and applications that dominate the news headlines (Snapchat, Instagram, Android or Tesla, either didn’t exist or were in their infancies ten years ago), whereas they would feel right at home in a school or a hospital. Let’s go back to the Germans ….
Of those who received numbers at Auschwitz-Birkenau, only 65,000 survived. It is estimated that only about 200,000 people who passed through the Auschwitz camps survived. Michael Bornstein was one of the lucky ones. Decades after the war, he learned from Auschwitz documents kept in Israel that he had survived because he was sick and the Nazis left him behind when they evacuated the camp. He said that he was one of only 52 children under the age of eight who lived.
In March 1943, the Krakow ghetto was being liquidated, and all the remaining Jews were being moved to the forced-labor camp of Plaszow, outside Krakow.  Schindler prevailed upon SS-Haupsturmführer Amon Goeth, the brutal camp commandant and a personal drinking companion, to allow him to set up a special sub-camp for his own Jewish workers at the factory site in Zablocie. There he was better able to keep the Jews under relatively tolerable conditions, augmenting their below-subsistence diet with food bought on the black market with his own money. The factory compound was declared out of bounds for the SS guards who kept watch over the sub-camp.
The most infamous doctor at Auschwitz was Josef Mengele, the "Angel of Death", who worked in Auschwitz II from 30 May 1943, at first in the gypsy family camp.[127] Particularly interested in performing research on identical twins, dwarfs, and those with hereditary disease, Mengele set up a kindergarten in barracks 29 and 31 for children he was experimenting on, and for all Romani children under six, where they were given better food rations.[128] From May 1944, he would select twins and dwarfs during selection on the Judenrampe,[129] reportedly calling for twins with "Zwillinge heraus!" ("twins step forward!").[130] He and other doctors (the latter prisoners) would measure the twins' body parts, photograph them, and subject them to dental, sight and hearing tests, x-rays, blood tests, surgery, and blood transfusions between them.[131] Then he would have them killed and dissected.[129] Kurt Heissmeyer, another German doctor and SS officer, took 20 Jewish children from Auschwitz to use in pseudoscientific medical experiments at the Neuengamme concentration camp.[132] In April 1945, the children were killed by hanging to conceal the project.[133]

The first 'bunker', with two sealed rooms, operated from January 1942 to the end of that year. The second, with four air tight rooms, became redundant in the spring of 1943, but remained standing and was used again in the autumn of 1944 when extra 'capacity' was needed for the murder of Hungarian Jews and the liquidation of the ghettos. The second measured about 1.134 square feet. The victims murdered in the 'bunkers' were first obliged to undress in temporary wooden barracks erected nearby. Their bodies were taken out of the gas chambers and pushed to pits where they were burned in the open. Between January 1942 and March 1943, 175,000 Jews were gassed to death here, of whom 105,000 were killed from January to March 1943.
By July 1944, Germany was losing the war; the SS began closing down the easternmost concentration camps and deporting the remaining prisoners westward. Many were killed in Auschwitz and the Gross-Rosen concentration camp. Schindler convinced SS-Hauptsturmführer Amon Göth, commandant of the nearby Kraków-Płaszów concentration camp, to allow him to move his factory to Brněnec in the Protectorate of Bohemia and Moravia, thus sparing his workers from almost certain death in the gas chambers. Using names provided by Jewish Ghetto Police officer Marcel Goldberg, Göth's secretary Mietek Pemper compiled and typed the list of 1,200 Jews who travelled to Brünnlitz in October 1944. Schindler continued to bribe SS officials to prevent the execution of his workers until the end of World War II in Europe in May 1945, by which time he had spent his entire fortune on bribes and black market purchases of supplies for his workers.