So well, what am I saying? So the task of killing was easy. I mean, here you could kill tens of thousands of people. It was all very quickly. The transportation arrived in the morning and by the evening everybody was dead. Interestingly, perhaps paradoxically, the more lethal a camp was, the less we know about it, because of chances of survival. You meet many people who survived Auschwitz, which we just did the day before yesterday, or whenever it was. Because it was possible to survive Auschwitz. Imagine, you have never met anyone who survived Treblinka or Sobibór. Actually later on in the fall of 1943, in both camps, first in Treblinka and then few weeks later in Sobibór there were breakouts ad something like 30 or 40 people manage to break out and some people survived. There's only two people who managed to some how escape from [INAUDIBLE]. But you know, there were 1000s of people who survived Auschwitz. So we know a great deal about Auschwitz. You see Auschwitz is the, how should I say it, the poster child of the holocaust. We talk about Auschwitz but there are places where the murder was, how should I say, much better organized and we know less about it, because there's nobody to tell the story. And we know about the stories and of Treblinka, and Sobibor and deaths because of German confessions, that is rather than what the Jews experienced. The way it was of course, again Jews carried out the most undesirable task of removing bodies and then carrying them into a crematorium and then these people also went through periodically negative selections. Meaning they were on the job for a week or so and then they themselves were killed. Get rid of the bodies. So the interesting part is that from the German point of view, the difficult part of the enterprise was A, to deliver the bodies,not to deliver the live human beings to the extermination camp and then the second difficult task was to get rid of the bodies. The first task was difficult, because in war time there is a shortage of rolling stock, that is, you need soldiers to be taken from one end of the front to another and consequently you heard about it. Dora Sorell was talking about what it was to be sent in the railroad carriage. And how the railroad carriage, the journey lasted for days. And the reason that the journeys lasted so long is because they had the lowest priorities in the very much over extended railroad network from the German point of view and consequently they didn't care whether it took two days or three days when people were entrained without food and water and people died. There were instances when 50% of the people after two or three days without water, and the heat in the summer and the trains arrived, 50% of them were dead. So, I mean, from the German point of view, these are the difficult task to take people to the extermination camp and second, what to do with the corpses. In Auschwitz for example and we'll talk about it later, in 1944, the crematoria cannot keep up with the number of bodies which are arriving. And so consequently they would bind lump corpses. Intermingling with wood, fire wood, and lighting up the fire, and then, as from the human body, the fat would ooze out. They reused it in order to make the fire hotter. In order to be able to burn more bodies. By the way they were experimenting with all sort of things. One of the characters by the name of Nebe, experimented with putting people in bunkers and blow up the bunkers. This was regarded as a failure as an experiment. This created too much of a mess. So the gas chambers were the most efficient methods of killing.