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A gas chamber is an apparatus for killing humans or other animals with gas, consisting of a sealed chamber into which a
poison Poison is a chemical substance that has a detrimental effect to life. The term is used in a wide range of scientific fields and industries, where it is often specifically defined. It may also be applied colloquially or figuratively, with a broa ...
ous or
asphyxiant gas An asphyxiant gas, also known as a simple asphyxiant, is a nontoxic or minimally toxic gas which reduces or displaces the normal oxygen concentration in breathing air. Breathing of oxygen-depleted air can lead to death by asphyxiation (suffocation ...
is introduced. Poisonous agents used include
hydrogen cyanide Hydrogen cyanide, sometimes called prussic acid, is a chemical compound with the formula HCN and structure . It is a colorless, extremely poisonous, and flammable liquid that boils slightly above room temperature, at . HCN is produced on a ...
and
carbon monoxide Carbon monoxide ( chemical formula CO) is a colorless, poisonous, odorless, tasteless, flammable gas that is slightly less dense than air. Carbon monoxide consists of one carbon atom and one oxygen atom connected by a triple bond. It is the simpl ...
.


History

General Rochambeau developed a rudimentary method in 1803, during the
Haitian Revolution The Haitian Revolution (french: révolution haïtienne ; ht, revolisyon ayisyen) was a successful insurrection by self-liberated slaves against French colonial rule in Saint-Domingue, now the sovereign state of Haiti. The revolt began on ...
, filling ships' cargo holds with sulfur dioxide to suffocate prisoners of war. The scale of these operations was brought to larger public attention in the 2005 book ''
Napoleon's Crimes ''Napoleon's Crimes: A Blueprint for Hitler'' (french: Le Crime de Napoléon) is a book published in 2005 by French writer Claude Ribbe, who is of Caribbean origin. In the book, Ribbe advances the thesis that Napoleon Bonaparte during the Haitia ...
'', although the allegations of scale and sources were heavily questioned. In America, the utilization of a gas chamber was first proposed by
Allan McLane Hamilton Allan McLane Hamilton (October 6, 1848 – November 23, 1919) was an American psychiatrist, specializing in suicide and the impact of accidents and trauma upon mental health, and in criminal insanity, appearing at several trials. He was a fou ...
to the state of Nevada. Since then, gas chambers have been used as a method of execution of condemned prisoners in the United States and continue to be a legal execution method in three states, seeing a possible, legislated reintroduction, although redundant in practice since the early 1990s.
Lithuania Lithuania (; lt, Lietuva ), officially the Republic of Lithuania ( lt, Lietuvos Respublika, links=no ), is a country in the Baltic region of Europe. It is one of three Baltic states and lies on the eastern shore of the Baltic Sea. Lithuania ...
used gas chambers for civilian, penal use in the 1930s, with the last known execution carried out in 1940. The
Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nationa ...
allegedly used the method to perform executions during the bloody
Great Purge The Great Purge or the Great Terror (russian: Большой террор), also known as the Year of '37 (russian: 37-й год, translit=Tridtsat sedmoi god, label=none) and the Yezhovshchina ('period of Yezhov'), was Soviet General Secreta ...
, including by use of
gas van A gas van or gas wagon (russian: душегубка, ''dushegubka'', literally "soul killer"; german: Gaswagen) was a truck reequipped as a mobile gas chamber. During the World War II Holocaust, Nazi Germany developed and used gas vans on a large ...
s. Prisoners were gassed on the way to the
Butovo firing range The Butovo Firing Range or Butovo Shooting Range (russian: Бутовский полигон) was an execution site of the Soviet secret police located near Drozhzhino in Leninsky District, Moscow Oblast from 1938 to 1953. Its use for mass ex ...
, where the
NKVD The People's Commissariat for Internal Affairs (russian: Наро́дный комиссариа́т вну́тренних дел, Naródnyy komissariát vnútrennikh del, ), abbreviated NKVD ( ), was the interior ministry of the Soviet Union. ...
normally executed its prisoners by shooting them.Tomasz Kizny, Dominique Roynette. ''La grande terreur en URSS 1937–1938''. Lausanne: Éd. Noir sur Blanc, 2013, p. 236. None of these saw mass use, however, and were strictly for "criminal" purposes. Most notably, during
the Holocaust The Holocaust, also known as the Shoah, was the genocide of European Jews during World War II. Between 1941 and 1945, Nazi Germany and its collaborators systematically murdered some six million Jews across German-occupied Europ ...
large-scale gas chambers designed for mass killing were used by
Nazi Germany Nazi Germany (lit. "National Socialist State"), ' (lit. "Nazi State") for short; also ' (lit. "National Socialist Germany") (officially known as the German Reich from 1933 until 1943, and the Greater German Reich from 1943 to 1945) was ...
from the late 1930s, as part of the
Aktion T4 (German, ) was a campaign of mass murder by involuntary euthanasia in Nazi Germany. The term was first used in post- war trials against doctors who had been involved in the killings. The name T4 is an abbreviation of 4, a street address o ...
, and later for its
genocide Genocide is the intentional destruction of a people—usually defined as an ethnic, national, racial, or religious group—in whole or in part. Raphael Lemkin coined the term in 1944, combining the Greek word (, "race, people") with the ...
program. More recently, escapees from
North Korea North Korea, officially the Democratic People's Republic of Korea (DPRK), is a country in East Asia. It constitutes the northern half of the Korean Peninsula and shares borders with China and Russia to the north, at the Yalu (Amnok) and T ...
have alleged executions to have been performed by gas chamber in prison camps, often combined with
medical experimentation Clinical trials are prospective biomedical or behavioral research studies on human participants designed to answer specific questions about biomedical or behavioral interventions, including new treatments (such as novel vaccines, drugs, dietar ...
.


Germany

Nazi Germany Nazi Germany (lit. "National Socialist State"), ' (lit. "Nazi State") for short; also ' (lit. "National Socialist Germany") (officially known as the German Reich from 1933 until 1943, and the Greater German Reich from 1943 to 1945) was ...
made extensive use of various types of gas chambers for mass-murder during
the Holocaust The Holocaust, also known as the Shoah, was the genocide of European Jews during World War II. Between 1941 and 1945, Nazi Germany and its collaborators systematically murdered some six million Jews across German-occupied Europ ...
. Beginning in 1939, gas chambers were used as part of ''
Aktion T4 (German, ) was a campaign of mass murder by involuntary euthanasia in Nazi Germany. The term was first used in post- war trials against doctors who had been involved in the killings. The name T4 is an abbreviation of 4, a street address o ...
'', an "
involuntary euthanasia Involuntary euthanasia occurs when euthanasia is performed on a person who would be able to provide informed consent, but does not, either because they do not want to die, or because they were not asked. Involuntary euthanasia is contrasted with ...
" program under which the Nazis murdered people with physical and intellectual disabilities, whom the Nazis considered "unworthy of life". Experiments in the gassing of patients were conducted in October 1939 in occupied Posen in Poland. Hundreds of prisoners were murdered by
carbon monoxide Carbon monoxide ( chemical formula CO) is a colorless, poisonous, odorless, tasteless, flammable gas that is slightly less dense than air. Carbon monoxide consists of one carbon atom and one oxygen atom connected by a triple bond. It is the simpl ...
poisoning in an improvised gas chamber. In 1940 gas chambers using bottled pure carbon monoxide were established at six killing centres in Germany. In addition to persons with disabilities, these centres were also used during
Action 14f13 Action 14f13, also called '' Sonderbehandlung'' (special treatment) 14f13 and Aktion 14f13, was a campaign by Nazi Germany to murder Nazi concentration camp prisoners. Also called ''invalid'' or ''prisoner euthanasia'', the sick, the elderly and ...
to murder prisoners transferred from concentration camps in Germany, Austria, and Poland. Concentration camp inmates continued to be murdered even after the euthanasia program was officially shut down in 1941. During the invasion of Russia, mass executions by
exhaust gas Exhaust gas or flue gas is emitted as a result of the combustion of fuels such as natural gas, gasoline (petrol), diesel fuel, fuel oil, biodiesel blends, or coal. According to the type of engine, it is discharged into the atmosphere through an ...
were performed by ''
Einsatzgruppen (, ; also ' task forces') were (SS) paramilitary death squads of Nazi Germany that were responsible for mass murder, primarily by shooting, during World War II (1939–1945) in German-occupied Europe. The had an integral role in the im ...
'' using
gas van A gas van or gas wagon (russian: душегубка, ''dushegubka'', literally "soul killer"; german: Gaswagen) was a truck reequipped as a mobile gas chamber. During the World War II Holocaust, Nazi Germany developed and used gas vans on a large ...
s, trucks modified to divert engine exhaust into a sealed interior gas chamber. Starting in 1941, gas chambers were used at
extermination camp Nazi Germany used six extermination camps (german: Vernichtungslager), also called death camps (), or killing centers (), in Central Europe during World War II to systematically murder over 2.7 million peoplemostly Jewsin the Holocaust. The v ...
s in Poland for the mass-murder of
Jews Jews ( he, יְהוּדִים, , ) or Jewish people are an ethnoreligious group and nation originating from the Israelites Israelite origins and kingdom: "The first act in the long drama of Jewish history is the age of the Israelites""The ...
,
Roma Roma or ROMA may refer to: Places Australia * Roma, Queensland, a town ** Roma Airport ** Roma Courthouse ** Electoral district of Roma, defunct ** Town of Roma, defunct town, now part of the Maranoa Regional Council * Roma Street, Brisbane, a ...
, and other victims of
the Holocaust The Holocaust, also known as the Shoah, was the genocide of European Jews during World War II. Between 1941 and 1945, Nazi Germany and its collaborators systematically murdered some six million Jews across German-occupied Europ ...
. Gas vans were used at the
Chełmno extermination camp , known for = , location = Near Chełmno nad Nerem, ''Reichsgau Wartheland'' (German-occupied Poland) , built by = , operated by = , commandant = Herbert Lange, Christian Wirth , original use = , construction = , in operatio ...
. The
Operation Reinhard or ''Einsatz Reinhard'' , location = Occupied Poland , date = October 1941 – November 1943 , incident_type = Mass deportations to extermination camps , perpetrators = Odilo Globočnik, Hermann Höfle, Richard Thomalla, Erwin L ...
extermination camps at Bełżec, Sobibór, and
Treblinka Treblinka () was an extermination camp, built and operated by Nazi Germany in occupied Poland during World War II. It was in a forest north-east of Warsaw, south of the village of Treblinka in what is now the Masovian Voivodeship. The cam ...
used exhaust fumes from stationary
diesel engine The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is a so-cal ...
s. In search of more efficient killing methods, the Nazis experimented with using the
hydrogen cyanide Hydrogen cyanide, sometimes called prussic acid, is a chemical compound with the formula HCN and structure . It is a colorless, extremely poisonous, and flammable liquid that boils slightly above room temperature, at . HCN is produced on a ...
-based fumigant
Zyklon B Zyklon B (; translated Cyclone B) was the trade name of a cyanide-based pesticide invented in Germany in the early 1920s. It consisted of hydrogen cyanide (prussic acid), as well as a cautionary eye irritant and one of several adsorbents such ...
at the
Auschwitz concentration camp Auschwitz concentration camp ( (); also or ) was a complex of over 40 concentration and extermination camps operated by Nazi Germany in occupied Poland (in a portion annexed into Germany in 1939) during World War II and the Holocaust. I ...
. This method was adopted for mass-murder at the Auschwitz and Majdanek camps. Up to 6,000 victims were gassed with Zyklon B each day at Auschwitz. Most extermination camp gas chambers were dismantled or destroyed in the last months of
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great power ...
as
Soviet The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, ...
troops approached, except for those at
Dachau Dachau () was the first concentration camp built by Nazi Germany, opening on 22 March 1933. The camp was initially intended to intern Hitler's political opponents which consisted of: communists, social democrats, and other dissidents. It is lo ...
,
Sachsenhausen Sachsenhausen () or Sachsenhausen-Oranienburg was a German Nazi concentration camp in Oranienburg, Germany, used from 1936 until April 1945, shortly before the defeat of Nazi Germany in May later that year. It mainly held political prisoners ...
and Majdanek. One destroyed gas chamber at Auschwitz was reconstructed after the war to stand as a memorial.


North Korea

Kwon Hyok, a former head of security at
Camp 22 Hoeryong concentration camp (or Haengyong concentration camp) was a prison camp in North Korea that was reported to have been closed in 2012. The official name was Kwalliso (penal labour colony) No. 22. The camp was a maximum security area, comp ...
, described laboratories equipped with gas chambers for suffocation gas experiments, in which three or four people, normally a family, are the experimental subjects. After the chambers are sealed and poison is injected through a tube, while scientists observe from above through glass. In a report reminiscent of an earlier account of a family of seven, Kwon claims to have watched one family of two parents, a son and a daughter die from suffocating gas, with the parents trying to save the children using mouth-to-mouth resuscitation for as long as they had the strength. Kwon's testimony was supported by documents from Camp 22 describing the transfer of prisoners designated for the experiments. The documents were identified as genuine by Kim Sang Hun, a London-based expert on Korea and human rights activist.


Lithuania

In 1937–1940,
Lithuania Lithuania (; lt, Lietuva ), officially the Republic of Lithuania ( lt, Lietuvos Respublika, links=no ), is a country in the Baltic region of Europe. It is one of three Baltic states and lies on the eastern shore of the Baltic Sea. Lithuania ...
operated a gas chamber in
Aleksotas The Aleksotas elderate ( lt, Aleksoto Seniunija) is an elderate in the southern section of the city of Kaunas, Lithuania, bordering the left bank of the Nemunas River. Its population in 2006 was 21,694. The elderate borders Vilijampolė and Ce ...
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 in January 1937, the criminal code was amended to provide execution by gas which at the time was viewed as more civilized and humane. Lithuania considered and rejected execution by poison. Unlike the American or German model the Lithuanian gas chamber, built out of bricks, worked by inputting compressed lethal gas from an external storage cylinder (Černevičiūtė 2014). The first execution was carried on July 27, 1937: Bronius Pogužinskas, age 37, convicted of murder of five people from a Jewish family. Historian Sigita Černevičiūtė counted at least nine executions in the gas chamber, though records are incomplete and fragmentary. Of the nine, eight were convicted of murder. One of these, Aleksandras Maurušaitis, was also convicted of anti-government actions during the 1935 Suvalkija strike. The last known execution took place on May 19, 1940 for robbery. The fate of the gas chamber after the occupation by the Soviet Union in June 1940 is unclear.


Soviet Union

According to Zhirnov, Soviet
NKVD The People's Commissariat for Internal Affairs (russian: Наро́дный комиссариа́т вну́тренних дел, Naródnyy komissariát vnútrennikh del, ), abbreviated NKVD ( ), was the interior ministry of the Soviet Union. ...
commander Isay Berg adapted vans with the storage compartment sealed and exhaust redirected inside it. These vans were used by the NKVD during the
Great Purge The Great Purge or the Great Terror (russian: Большой террор), also known as the Year of '37 (russian: 37-й год, translit=Tridtsat sedmoi god, label=none) and the Yezhovshchina ('period of Yezhov'), was Soviet General Secreta ...
(1936–1938) under disguise of bread vans to poison the victims during their transportation to the execution.


United States

Gas chambers have been used for
capital punishment in the United States In the United States, capital punishment is a legal penalty throughout the country at the federal level, in 27 states, and in American Samoa. It is also a legal penalty for some military offenses. Capital punishment has been abolished in 23 ...
to execute death row inmates. The first person to be executed in the United States by lethal gas was
Gee Jon Gee Jon ( 1895 – February 8, 1924) was a Chinese national who was the first person in the United States to be executed by lethal gas. A member of the Hip Sing Tong criminal society from San Francisco, California, Gee was sentenced to death fo ...
, on February 8, 1924. An unsuccessful attempt to pump poison gas directly into his cell at
Nevada State Prison Nevada State Prison (NSP) was a penitentiary located in Carson City. The prison was in continuous operation since its establishment in 1862 and was managed by the Nevada Department of Corrections. It was one of the oldest prisons still operatin ...
led to the development of the first makeshift gas chamber to carry out Jon's death sentence. On December 3, 1948,
Miran Thompson Miran Edgar Thompson (December 16, 1917 – December 3, 1948) was an inmate of Alcatraz whose participation in an attempted escape on May 2, 1946, led to his execution in the gas chamber of San Quentin. At the time of the Battle of Alcatraz, ...
and
Sam Shockley Samuel Richard Shockley, Jr. (January 12, 1909 – December 3, 1948) was an inmate at Alcatraz prison, who was executed for his participation in the Alcatraz uprising or Battle of Alcatraz in 1946. Background Sam Shockley was born in Cerro ...
were executed in the gas chamber at
San Quentin State Prison San Quentin State Prison (SQ) is a California Department of Corrections and Rehabilitation state prison for men, located north of San Francisco in the unincorporated place of San Quentin in Marin County. Opened in July 1852, San Quentin is t ...
for their role in the
Battle of Alcatraz The Battle of Alcatraz, which lasted from May 2 to 4, 1946, was the result of an escape attempt at Alcatraz Federal Penitentiary by armed convicts. Two Federal Bureau of Prisons officers—William A. Miller and Harold Stites—were killed (Mille ...
. In 1957,
Burton Abbott Burton Wilbur Abbott (February 8, 1928 – March 15, 1957) was a University of California at Berkeley accounting student living in Alameda, California, who was convicted in November 1955 of the rape and murder of 14-year-old Stephanie Bryan. ...
was executed as the governor of California,
Goodwin J. Knight Goodwin Jess "Goodie" Knight (December 9, 1896 – May 22, 1970) was an American politician who served as the 31st governor of California from 1953 until 1959. A member of the Republican Party, he previously was the 35th lieutenant governor of ...
, was on the telephone to stay the execution. Since the restoration of the death penalty in the United States in 1976, 11 executions by gas chamber have been conducted. Four were conducted in
Mississippi Mississippi () is a state in the Southeastern region of the United States, bordered to the north by Tennessee; to the east by Alabama; to the south by the Gulf of Mexico; to the southwest by Louisiana; and to the northwest by Arkansas. Miss ...
, 2 in
Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...
, 2 in
California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...
, 2 in
North Carolina North Carolina () is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. The state is the List of U.S. states and territories by area, 28th largest and List of states and territories of the United ...
, and 1 in
Nevada Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. N ...
. The first execution via gas chamber since the restoration of the death penalty was in Nevada in 1979, when
Jesse Bishop Jesse Walter Bishop (March 1, 1933 – October 22, 1979) was an American criminal convicted of the December 1977 murder of David Ballard during a robbery at a Las Vegas Strip casino. Bishop was executed in 1979 by the state of Nevada via gas cha ...
was executed for murder. The most recent execution via gas chamber was in 1999. By the 1980s, reports of suffering during gas chamber executions had led to controversy over the use of this method. At the September 2, 1983, execution of Jimmy Lee Gray in
Mississippi Mississippi () is a state in the Southeastern region of the United States, bordered to the north by Tennessee; to the east by Alabama; to the south by the Gulf of Mexico; to the southwest by Louisiana; and to the northwest by Arkansas. Miss ...
, officials cleared the viewing room after 8 minutes while Gray was still alive and gasping for air. The decision to clear the room while he was still alive was criticized by his attorney. In 2007,
David Bruck David Isaac Bruck (born 1949) is a Canadian-American criminal defense attorney, clinical professor of law at Washington and Lee University School of Law, and director of the Virginia Capital Case Clearinghouse. Bruck was raised in Montreal, Queb ...
, an attorney specializing in death penalty cases, said, "Jimmy Lee Gray died banging his head against a steel pole in the gas chamber while reporters counted his moans." During the April 6, 1992, execution of Donald Eugene Harding in
Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...
, it took 11 minutes for death to occur. The prison warden stated that he would quit if required to conduct another gas chamber execution. Following Harding's execution, Arizona voted that all persons condemned to death after November 1992 would be executed by
lethal injection Lethal injection is the practice of injecting one or more drugs into a person (typically a barbiturate, paralytic, and potassium solution) for the express purpose of causing rapid death. The main application for this procedure is capital puni ...
. Following the execution of
Robert Alton Harris Robert Alton Harris (January 15, 1953 – April 21, 1992) was an American car thief, burglar, kidnapper and murderer who was executed at San Quentin State Prison in 1992 for the 1978 murders of two teenage boys in San Diego. His execution was the ...
in 1992, a federal court declared that "execution by lethal gas under the California protocol is unconstitutionally cruel and unusual." By the late 20th century, most states had switched to methods considered to be more humane, such as lethal injection. California's gas chamber at San Quentin State Prison was converted to an execution chamber for lethal injection. As of 2020, the last person to be executed in the gas chamber was German national Walter LaGrand, sentenced to death before 1992, who was executed in
Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...
on March 3, 1999. The
U.S. Court of Appeals for the Ninth Circuit The United States Court of Appeals for the Ninth Circuit (in case citations, 9th Cir.) is the U.S. federal court of appeals that has appellate jurisdiction over the U.S. district courts in the following federal judicial districts: * District o ...
had ruled that he could not be executed by gas chamber, but the decision was overturned by the
United States Supreme Court The Supreme Court of the United States (SCOTUS) is the highest court in the federal judiciary of the United States. It has ultimate appellate jurisdiction over all U.S. federal court cases, and over state court cases that involve a point o ...
. The gas chamber was formerly used in
Colorado Colorado (, other variants) is a state in the Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the western edge of the ...
,
Nevada Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. N ...
,
New Mexico ) , population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano) , seat = Santa Fe, New Mexico, Santa Fe , LargestCity = Albuquerque, New Mexico, Albuquerque , LargestMetro = Albuquerque metropolitan area, Tiguex , Offi ...
,
North Carolina North Carolina () is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. The state is the List of U.S. states and territories by area, 28th largest and List of states and territories of the United ...
and
Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...
. Six states (Arizona, California,
Maryland Maryland ( ) is a state in the Mid-Atlantic region of the United States. It shares borders with Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware and the Atlantic Ocean t ...
, Mississippi,
Missouri Missouri is a state in the Midwestern region of the United States. Ranking 21st in land area, it is bordered by eight states (tied for the most with Tennessee): Iowa to the north, Illinois, Kentucky and Tennessee to the east, Arkansas t ...
, and
Wyoming Wyoming () is a state in the Mountain West subregion of the Western United States. It is bordered by Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho to the west, Utah to the southwest, and Colorado to t ...
) authorize lethal gas if lethal injection cannot be administered, the condemned committed their crime before a certain date, or the condemned chooses to die in the gas chamber. In October 2010,
Governor of New York The governor of New York is the head of government of the U.S. state of New York. The governor is the head of the executive branch of New York's state government and the commander-in-chief of the state's military forces. The governor h ...
David Paterson David Alexander Paterson (born May 20, 1954) is an American politician and attorney who served as the 55th governor of New York, succeeding Eliot Spitzer and serving out nearly three years of Spitzer's term from March 2008 to December 2010. A ...
signed a bill rendering gas chambers illegal for use by humane societies and other animal shelters.


Method of use


Using hydrogen cyanide

As implemented in the United States, the 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 to halt once initiated, which has occurred in the case of stays, such as in the case of
Burton Abbott Burton Wilbur Abbott (February 8, 1928 – March 15, 1957) was a University of California at Berkeley accounting student living in Alameda, California, who was convicted in November 1955 of the rape and murder of 14-year-old Stephanie Bryan. ...
. The same event supposedly occurred in the final, completed execution of
Caryl Chessman Caryl Whittier Chessman (May 27, 1921 – May 2, 1960) was a convicted robber, kidnapper and serial rapist who was sentenced to death for a series of crimes committed in January 1948 in the Los Angeles area. Chessman was charged with 17 counts ...
in 1960. The condemned person is strapped into a chair within an airtight chamber, which is then sealed. The executioner activates a mechanism which drops
potassium cyanide Potassium cyanide is a compound with the formula KCN. This colorless crystalline salt, similar in appearance to sugar, is highly soluble in water. Most KCN is used in gold mining, organic synthesis, and electroplating. Smaller applications inc ...
(or
sodium cyanide Sodium cyanide is a poisonous compound with the formula Na C N. It is a white, water-soluble solid. Cyanide has a high affinity for metals, which leads to the high toxicity of this salt. Its main application, in gold mining, also exploits its hi ...
) pellets into a bath of
sulfuric acid Sulfuric acid (American spelling and the preferred IUPAC name) or sulphuric acid ( Commonwealth spelling), known in antiquity as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen and hydrogen, with the molecular fo ...
beneath the chair; the ensuing chemical reaction generates lethal
hydrogen cyanide Hydrogen cyanide, sometimes called prussic acid, is a chemical compound with the formula HCN and structure . It is a colorless, extremely poisonous, and flammable liquid that boils slightly above room temperature, at . HCN is produced on a ...
gas. The gas is visible to the condemned, who is advised to take several deep breaths to speed unconsciousness. Nonetheless, the condemned person often convulses and drools and may also urinate, defecate, and vomit. Following the execution the chamber is purged with air, and any remnant gas is neutralized with
anhydrous ammonia Ammonia is an inorganic compound of nitrogen and hydrogen with the formula . A stable binary hydride, and the simplest pnictogen hydride, ammonia is a colourless gas with a distinct pungent smell. Biologically, it is a common nitrogenous wast ...
, after which the body can be removed (with great caution, as pockets of gas can be trapped in the victim's clothing).


Excluding all oxygen

Nitrogen gas or oxygen-depleted air has been considered for human execution, as it can induce
nitrogen asphyxiation Inert gas asphyxiation is a form of asphyxiation which results from breathing a physiologically inert gas in the absence of oxygen, or a low amount of oxygen, rather than atmospheric air (which is composed largely of nitrogen and oxygen). Example ...
. The victim detects little abnormal sensation as the oxygen level falls. This leads to
asphyxia Asphyxia or asphyxiation is a condition of deficient supply of oxygen to the body which arises from abnormal breathing. Asphyxia causes generalized hypoxia, which affects primarily the tissues and organs. There are many circumstances that can ...
tion (death from lack of oxygen) without the painful and traumatic feeling of suffocation, or the side effects of poisoning. In April 2015,
Oklahoma Governor The governor of Oklahoma is the head of government of the U.S. state of Oklahoma. Under the Oklahoma Constitution, the governor serves as the head of the Oklahoma executive branch, of the government of Oklahoma. The governor is the ''ex officio ...
Mary Fallin Mary Fallin (; née Copeland; born December 9, 1954) is an American politician who served as the 27th governor of Oklahoma from 2011 to 2019. A member of the Republican Party, she was elected in 2010 and reelected in 2014. She was the first and s ...
approved a bill allowing nitrogen asphyxiation as an execution method. On March 14, 2018, Oklahoma Attorney General Mike Hunter and Corrections Director Joe M. Allbaugh announced a switch to nitrogen gas as the state's primary method of execution. After struggling for years to design a nitrogen execution protocol, the State of Oklahoma announced in February 2020 that it was abandoning the project after finding a reliable source of drugs to carry out the lethal injection executions. In 2018 Alabama approved nitrogen asphyxiation as an execution method and allowed death row inmates a choice of method. An execution by lethal injection was stayed by a court In September 2022 because the inmate claimed to have made the election of nitrogen asphyxiation but the form had been lost.


Further reading

* Christianson, Scott (2010). ''The Last Gasp: The rise and fall of the American gas chamber'' (Kindle edition). Berkeley:
University of California Press The University of California Press, otherwise known as UC Press, is a publishing house associated with the University of California that engages in academic publishing. It was founded in 1893 to publish scholarly and scientific works by facul ...
,


References


External links

* {{DEFAULTSORT:Gas Chamber Infrastructure of the Holocaust Execution methods Execution equipment Toxicology