It is not made clear when the text was written.
Some noteworthy passages:
The kapos stood waiting. Wagner barked out an order, and the kapos led groups away. The kapos told us--12 men- to line up and remain standing to the side. Each kapo knew where to lead his group. Some Jews plaintively asked where they were being led to. The kapos told them that they were being taken to the showers, to be disinfected. Those Jews were happy to believe this. It was true--they were filthy because they had been dragged out of their bunkers and had not been given any water at all. Many were covered with lice. Sure--they needed showers. They needed disinfecting. It was obvious.
Wewryk affirms that there existed a good reason for Jewish deportees having to take showers - they were often filthy and lice-ridden.
We--the workers in the Sobibor shops--were told about the whole process by the kapos. If the SS had found out they would have killed those kapos immediately and us too. The actual killing process was kept very secret. However, after 2 or 3 days there, the all-pervasive stench was self-explanatory.
You could tell most Jews one thousand times what was really going on there and they wouldn't believe you. People believe what they want to believe, or hope to believe- anything but the truth, if that truth is horrible enough. I myself spoke to some women wearing crucifixes, from Germany. They or their parents had converted to Christianity. I asked them: "Do you know where you are? Do you know what happens here?" I told them and they didn't believe me; they couldn't believe that such a place was possible. They answered me: "What do you mean when you say that they gas and burn people here? Such things in the middle of the 20th century? Are you crazy?" They simply couldn't understand it. Had people believed what was in store for them they would have resisted, but nobody believed. This was in 1942.
Could not believe it? With a stench of corpses pervading the whole area and huge tongues of fire leaping towards the skies day and night? This seems to be a common thread in many of the Aktion Reinhardt testimonies: at one hand, it is claimed that it was obvious that the camps were "death factories": a stench of rotting corpses, giant flames etc; on the other hand, the witness fails to convince incoming deportees of this "obvious fact".
More on the alleged enormous secrecy surrounding he camps:
He told us how many of the unfortunates had raw wounds and festering sores; their clothes had become stuck to the congealed blood and scars. When the clothes were ripped off them their pain was enormous--they yelled at the top of their lungs. I worked in the carpentry shop and I heard, many times, the yelling of such unfortunates. Had I shown any interest at all I would have been shot on the spot. Sobibor was supposed to be a "secret"--nobody was supposed to know anything. Anybody who showed any interest in the "process" was immediately shot.
Some of the usual German (and Ukranian) perversity:
After a transport was "processed" the Ukrainians and SS celebrated. In their Lager they had a casino, so they drank and sang and gorged themselves ("fressed").
There were many Ukrainians at Sobibor--horrible murderers! Extraordinary sadists!
Expansions of the camp was according to Wewryk a mere ruse:
I worked with a group of carpenters. We had much to do because the Germans were always expanding and "improving" Sobibor. These were make-work projects devised by the Germans so they shouldn't be sent to the front. The eastern front was a meat-grinder, devouring people en masse, so the Germans were eager to seize on any excuse to make themselves look busy.
The nasty Germans really look forward to killing innocent Jews:
When the SS man was called he came into the workshop right away. They were very happy to come--it gave them something to do and allowed them to look busy. They were bored between transports, and they didn't want to be sent to the front. The arrival of a transport galvanized these Germans into action--they came to life and all of their sadism and savagery welled up. They lusted for those transports. When no transports came, the Germans ordered the prisoners to plant trees and flowers, build bathing areas for the SS, etc. There was always work to be done.
Another Holohoax classic, murder-by-falling-trees:
Incidentally, a number of other Jews were killed when they were ordered to the tops of trees. When the trees came crashing down, those poor unfortunates were killed. The Germans regarded this as "entertainment."
More on the super secret killing center Lager III into which no prisoners could look in - but everybody knew it was a slaughterhouse!
The gassing and burning was done in Camp No. 3. About 200 Jews lived permanently in that slaughterhouse, but we had no contact with them. We weren't even allowed to look in the direction of Camp No. 3. That slaughterhouse, Camp No. 3, was supposed to be very secret. We were supposed to pretend that it didn't exist, and that we were totally unaware of it. However, only a severely retarded person [such as all the Jews who wouldn't believe Kalmen's story on their arrival?] could remain ignorant of what went on there. The smoke and the smell said it all and we occasionally heard a terrified "Shma Yizroel " echo over to us from there. A friendly kapo once told me that, after the poor Jews had been gassed in the "showers," the floor would open up and the bodies would drop down, to be dragged away by those prisoner-Jews for burning. The kapo told me that one of the Jews there had seen his own wife's body in the tangled mass of corpses. Many Jews resisted and had to be beaten into the gas chamber. The kapo told me that the healthier Jews took longer to die from the gas. They suffered more.
Every day brought new horrors. I remember when the Germans even arranged a "wedding" of two Jewish prisoners. This was a complete wedding celebration, with rabbis, festivities, music, etc. They picked a Jewish singer dancer from France as the chief soloist at the festivities. Ach, did she sing! So beautifully, and with such expression! The Germans had prepared this wedding celebration for their own grotesque propaganda purpose. They filmed the wedding completely, and right afterwards all the participants, including the French soloist, were taken to the gas chamber.
So they even had film cameras in Sobibor? Where is all the footage now?