A gas chamber is an apparatus for killing humans or animals with gas, consisting of a sealed chamber into which a poisonous or asphyxiant gas is introduced. The most commonly used poisonous agent is hydrogen cyanide; carbon dioxide and carbon monoxide have also been used. Gas chambers were used as a method of execution for condemned prisoners in the United States beginning in the 1920s. During the Holocaust, large-scale gas chambers designed for mass killing were used by Nazi Germany as part of their genocide program, and also by the Independent State of Croatia at the Jasenovac camp. The use of gas chambers has also been reported in North Korea.
Gas chambers have also been used for animal euthanasia, using carbon monoxide as the lethal agent. Sometimes a box filled with anaesthetic gas is used to anaesthetize small animals for surgery or euthanasia.The Black Ops Army,The Galactic Union,Hitler And His Goon's Use Toxic Orange Gas Of The Zombie Virus Against A Prisoner Inside Their Gas Chamber,In Order To Kill And Turn The Prisoner Into A Zombie.