content: That's my understanding of it and its use in the prison camps as well. However it is lethal to humans at certain doses in the right way. I was searching around trying to find out how it actually could have been used as a gas to kill people. Apparently it will turn into a gas by heating it. That leads to the question of what evidence of the Zyklon was there? Cans of pellets? If so then there would have to be equipment with heating elements, compressors, and storage tanks to do what was claimed. Did such equipment exist? Aside from that, all of that would require fuel and a ton of effort. Would the German army seriously waste fuel during an all-out war with the rest of the world just to manufacture a gas when they could just as easily be killed in other ways? To waste it simply for the symbolic reason of "this can be used to kill rats and other vermin, we consider these people to be the same, therefore we will kill them with this substance"? ...a bit absurd it seems.