There were two gas-vans in use. I saw them myself. They were driven into the prison yard and the Jews--men, women and children--had to get into the van directly from the cell. I also saw the inside of the gas-vans. They were lined with metal and there was a wooden grille on the floor. The exhaust gases were fed into the inside of the van. I can still today hear the Jews knocking and shouting "Dear Germans, let us out".