I can only repeat what my late father told me. The wooden building appeared to be disguised as a shower room with a water tank on the roof. He did mention that there was a crematorium oven nearby but I cannot remember exactly what he said. My father died in 1972 so my memories are over 30 years old. He did explore the complex which had been built recently and noted the blast proof hermetically sealed doors. There was a hatch in the ceiling leading to the hut above. Each hatch was also hermetically sealed and identified by a letter and a number such as A3.
The Jews killed represented around one third of the world population of Jews,[398] and about two-thirds of European Jewry, based on an estimate of 9.7 million Jews in Europe at the start of the war.[399] Much of the uncertainty stems from the lack of a reliable figure for the number of Jews in Europe in 1939, numerous border changes that make avoiding double-counting of victims difficult, lack of accurate records from the perpetrators, and uncertainty about whether deaths occurring months after liberation, but caused by the persecution, should be counted.[392]
In April 1943, the SS took over the southern section of the camp and turned it into an “exchange camp” for Jewish prisoners. The SS decided in the spring of 1944 to also use the camp for other purposes and additional groups of prisoners. This dramatically changed the character of the camp, the structure of the prisoner society and, above all, the prisoners’ living conditions. When the Bergen-Belsen concentration camp was liberated on 15 April 1945, British soldiers found thousands of unburied bodies and tens of thousands of severely ill prisoners.
Prisoners were divided into categories. At first, they were classified by the nature of the crime for which they were accused, but eventually were classified by the specific authority-type under whose command a person was sent to camp.[57]:53 Political prisoners who had been arrested by the Gestapo wore a red badge, "professional" criminals sent by the Criminal Courts wore a green badge, Cri-Po prisoners arrested by the criminal police wore a brown badge, "work-shy and asocial" people sent by the welfare authorities or the Gestapo wore a black badge, Jehovah's Witnesses arrested by the Gestapo wore a violet badge, homosexuals sent by the criminal courts wore a pink badge, emigrants arrested by the Gestapo wore a blue badge, "race polluters" arrested by the criminal court or Gestapo wore badges with a black outline, second-termers arrested by the Gestapo wore a bar matching the color of their badge, "idiots" wore a white armband with the label Blöd (Stupid), and Jews, whose incarceration in the Dachau concentration camp dramatically increased after Kristallnacht, wore a yellow badge, combined with another color.[57]:54–69
Another Polish courier, Jan Karski, reached the west in November 1942, carrying messages from Jewish leaders in Poland. He had himself witnessed the conditions in the Warsaw ghetto and in what he believed to be the Belzec death camp, and was eager to inform the world. Karski saw the British foreign secretary, Anthony Eden, and US President Roosevelt, but they seemed to be more interested in military intelligence than in atrocity stories. Partly as a result of Karski's mission, however, the Allies agreed to a joint declaration, read to the British Parliament on 17 December, which acknowledged Nazi war crimes and threatened punishment for the perpetrators. Subsequently millions of leaflets were dropped in the course of bombing raids on German cities to inform Germans of the facts, but these had little or no effect.
Germany invaded the Soviet Union in June 1941.[236] German propaganda portrayed the war against the Soviet Union as both an ideological war between German National Socialism and Jewish Bolshevism and a racial war between the Germans and the Jewish, Romani and Slavic Untermenschen ("sub-humans").[237] Local populations in some occupied Soviet territories actively participated in the killing of Jews and others, and helped identify and round up Jews.[238] German involvement ranged from active instigation and involvement to general guidance.[239] In Lithuania, Latvia, and western Ukraine, locals were deeply involved in the murder of Jews from the beginning of the German occupation. Some of these Latvian and Lithuanian units also participated in the murder of Jews in Belarus. In the south, Ukrainians killed about 24,000 Jews and some went to Poland to serve as concentration and death-camp guards.[238] Military units from some countries allied to Germany also killed Jews. Romanian units were given orders to exterminate and wipe out Jews in areas they controlled.[240] Ustaše militia in Croatia persecuted and murdered Jews, among others.[168] Many of the killings were carried out in public, a change from previous practice.[241]

Timothy D. Snyder (Bloodlands: Europe Between Hitler and Stalin, 2010): "In this book the term Holocaust signifies the final version of the Final Solution, the German policy to eliminate the Jews of Europe by murdering them. Although Hitler certainly wished to remove the Jews from Europe in a Final Solution earlier, the Holocaust on this definition begins in summer 1941, with the shooting of Jewish women and children in the occupied Soviet Union. The term Holocaust is sometimes used in two other ways: to mean all German killing policies during the war, or to mean all oppression of Jews by the Nazi regime. In this book, Holocaust means the murder of the Jews in Europe, as carried out by the Germans by guns and gas between 1941 and 1945."[23]
The Nazis used the phrase Lebensunwertes Leben (life unworthy of life) in reference to the disabled and mentally ill.[92] On 14 July 1933, the Law for the Prevention of Hereditarily Diseased Offspring (Gesetz zur Verhütung erbkranken Nachwuchses), the Sterilization Law, was passed, allowing for compulsory sterilization.[93][94] The New York Times reported on 21 December that year: "400,000 Germans to be sterilized".[95] There were 84,525 applications from doctors in the first year. The courts reached a decision in 64,499 of those cases; 56,244 were in favor of sterilization.[96] Estimates for the number of involuntary sterilizations during the whole of the Third Reich range from 300,000 to 400,000.[97]
Beginning in late 1941, the Germans began mass transports from the ghettoes in Poland to the concentration camps, starting with those people viewed as the least useful: the sick, old and weak and the very young. The first mass gassings began at the camp of Belzec, near Lublin, on March 17, 1942. Five more mass killing centers were built at camps in occupied Poland, including Chelmno, Sobibor, Treblinka, Majdanek and the largest of all, Auschwitz-Birkenau. From 1942 to 1945, Jews were deported to the camps from all over Europe, including German-controlled territory as well as those countries allied with Germany. The heaviest deportations took place during the summer and fall of 1942, when more than 300,000 people were deported from the Warsaw ghetto alone.
Responding with alarm to Hitler’s rise, the Jewish community sought to defend their rights as Germans. For those Jews who felt themselves fully German and who had patriotically fought in World War I, the Nazification of German society was especially painful. Zionist activity intensified. “Wear it with pride,” journalist Robert Weltsch wrote in 1933 of the Jewish identity the Nazis had so stigmatized. Religious philosopher Martin Buber led an effort at Jewish adult education, preparing the community for the long journey ahead. Rabbi Leo Baeck circulated a prayer for Yom Kippur (the Day of Atonement) in 1935 that instructed Jews on how to behave: “We bow down before God; we stand erect before man.” Yet while few, if any, could foresee its eventual outcome, the Jewish condition was increasingly perilous and was expected to worsen.
When SS chief Heinrich Himmler learned of the typhus outbreak at Bergen-Belsen, he immediately issued an order to all appropriate officials requiring that "all medical means necessary to combat the epidemic should be employed ... There can be no question of skimping either with doctors or medical supplies." However, the general breakdown of order that prevailed on Germany by this time made it impossible to implement the command. /13
Schindler was arrested twice on suspicion of black market activities and once for breaking the Nuremberg Laws by kissing a Jewish girl, an action forbidden by the Race and Resettlement Act. The first arrest, in late 1941, led to him being kept overnight. His secretary arranged for his release through Schindler's influential contacts in the Nazi Party. His second arrest, on 29 April 1942, was the result of his kissing a Jewish girl on the cheek at his birthday party at the factory the previous day. He remained in jail five days before his influential Nazi contacts were able to obtain his release.[55] In October 1944, he was arrested again, accused of black marketeering and bribing Göth and others to improve the conditions of the Jewish workers. He was held for most of a week and released.[56] Göth had been arrested on 13 September 1944 for corruption and other abuses of power, and Schindler's arrest was part of the ongoing investigation into Göth's activities.[57] Göth was never convicted on those charges, but was hanged by the Supreme National Tribunal of Poland for war crimes on 13 September 1946.[58][59]

Außenlager Unterlüß-Altensothrieth (Tannenberglager) east of Bergen was in use from late August 1944 to April 13, 1945. It was located at Unterlüß, where the Rheinmetall-Borsig AG had a large test site. Up to 900 female Polish, Hungarian, Romanian, Yugoslavian and Czech Jews had to clear forest, do construction work or work in munitions production.[10]:204