Outside wall of gas chamber has two bins for pouring
in Zyklon B gas pellets
Zyklon B pellets produce poisonous cyanide gas when heated,
although there is no heating device used in the Baracke X gas
chamber. The bins have hinges on the bottom so that they can
be opened or closed. The rectangular hole in the wall is covered
by a piece of wood, and there is no corresponding hole inside
the gas chamber.