General Rochambeau developed a rudimentary method in 1803, during the Haitian Revolution, filling ships' cargo holds … See more

Nazi Germany made extensive use of various types of gas chambers for mass-murder during the Holocaust.
Beginning in 1939, gas chambers were used as part of Aktion T4, an "involuntary euthanasia" … See more

Kwon Hyok, a former head of security at Camp 22, described laboratories equipped with gas chambers for suffocation gas experiments, in which three or four people, normally a family, are the experimental subjects. Af… See more

In 1937–1940, Lithuania operated a gas chamber in Aleksotas within the First Fort of the Kaunas Fortress. Previous executions were carried out by hanging or by shooting. However, these methods were viewed as brutal and i… See more

Soviet NKVD commander Isay Berg adapted vans with the storage compartment sealed and exhaust redirected inside it. See more

Gas chambers have been used for capital punishment in the United States to execute death row inmates. The first person to be executed in the United States by lethal gas was Gee Jon, on February 8, 1924. An unsuccessf… See more

The hydrogen cyanide gas chamber is considered to be the most dangerous, most complicated, most time-consuming and most expensive method of administering the death penalty. It is also notoriously impossible … See more