Gas chamber carbon monoxide as the lethal agent. Sometimes a box filled with anesthetic gas is used to anesthetize small animals for surgery or euthanasia. Gas chamber A gas chamber is an apparatus for killing humans or other 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 and continue to be a legal execution method in
Treblinka extermination camp were gassed to death with the exhaust fumes conducted through pipes from an engine of a Red Army tank. SS-"Scharführer" Erich Fuchs was responsible for installing it. The engine was brought in by the SS at the time of the camp's construction and housed in a room with a generator that supplied the camp with electricity. The tank engine exhaust pipe ran just below the ground and opened into all three gas chambers. The fumes could be seen seeping out. After about 20 minutes the bodies were removed by dozens of "Sonderkommandos", placed onto carts and wheeled away. The system