The hatches were a post war addition, the door was fastened by a latch mechanism that could be opened from the INSIDE. In other camps the inside latches were sawn off. There was a film on YT made by a Jewish guy who spent 3 days at Auschwitz, he was joined by Ernst Zundel and they both concluded that the building that was supposed to be a gas chamber was most likely a bomb shelter: it had the remains of a bathroom, a kitchen and there was clearly a telephone connection! The ovens were used for burning lice infected clothing and hair - they were way too small to process bodies. A modern crematorium takes a considerable time to reduce bodies to ashes at very high temperatures - there was no way these ovens could have burnt bodies. I could go on: the most damming point was there were NO traces of zyklon in the fabric of the building. Where this was used as a delousing agent, the walls were stained blue. So many other points that clearly show the mass extinction program highly unlikely.

The concept of the ovens was invented to cover up the lack of mass graves. There were less than 175k Jews living in Germany at the start of the war. Over half had left for other countries. We're supposed to believe that every Jew in Poland was killed during the war. At 3 million, that is half the total.