Krema 1 was the first gas chamber to be built at Auschwitz in 1940. Initially, it was used to kill Soviet prisoners of war, but later it was converted into an air raid shelter. In 1942, it was reconstructed as a gas chamber and operated until mid-1943. The chamber was located in the basement of a building in the Auschwitz main camp, adjacent to the crematorium. It had a capacity of 700 people per killing. The corpses were then transported to the crematorium to be burned. Krema 1 was one of the first sites of mass murder in Auschwitz, and its operation set a precedent for the other Auschwitz gas chambers in the complex.

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Krema II was one of the four main gas chambers in Auschwitz II-Birkenau, which was built in early 1943. The chamber had a capacity of around 2,000 people per killing. It used Zyklon B gas to murder prisoners, most of whom were Jews. The chamber was located adjacent to a crematorium, where the bodies were burned. Krema II was in operation until November 1944 when the Nazis destroyed the Auschwitz gas chambers in an effort to conceal their crimes. The destruction of Krema II was a significant event in the history of the Holocaust and symbolizes the horrors of the genocide committed by the Nazis.

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Krema III was one of the four main Auschwitz gas chambers II-Birkenau. It was built in 1943, adjacent to a crematorium, and had a capacity of around 2,000 people per killing. The gas chamber was disguised as a shower room to deceive the prisoners. Zyklon B gas was used to kill the inmates, who were mostly Jewish. The corpses were then burned in the nearby crematorium. Krema III was destroyed by the Nazis in 1944 in an effort to conceal their crimes. The operation of Krema III is a haunting reminder of the atrocities committed during the Holocaust.

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Krema IV was one of the four main Auschwitz gas chambers II-Birkenau, built in 1943. The gas chamber had a capacity of around 1,500 people per killing and used Zyklon B gas to murder the prisoners, mostly Jews. The chamber was located next to a crematorium where the bodies were burned. Krema IV was destroyed in 1944 by the Nazis in an attempt to conceal their crimes. The operation of Krema IV is a tragic reminder of the atrocities committed during the Holocaust and the horrors of the Nazi regi.

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Krema V was a gas chamber and crematorium facility located in the Auschwitz-Birkenau concentration camp complex. It was constructed in early 1943 and operated until October 1944, during which time it was responsible for the deaths of thousands of prisoners, mainly Jews. The facility consisted of two gas chambers and a crematorium, as well as living quarters for the staff. After the war, the site was dismantled and today only the ruins of the building remain. It serves as a memorial to the victims of the Holocaust and a reminder of the atrocities committed at Auschwitz.

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