The gas van or gas wagon (Russian: душегубка (dushegubka); German: Gaswagen) was a vehicle reequipped as a mobile gas chamber. The vehicle had an air-tight compartment for victims into which exhaust fumes were transmitted while the engine was running. The victims were gassed with carbon monoxide, resulting in death by monoxide poisoning and suffocation. The gas van was invented and used by the Soviet secret police NKVD in the end of 1930s during the Great Purge. It was later widely implemented as an extermination method in Nazi Germany to kill victims of the regime, mostly Jews.
Invention and use in Soviet Union
The gas van was invented in the Soviet Union in 1936, allegedly by Isay Berg, the head of the administrative and economic department of the NKVD of Moscow Oblast which suffocated batches of prisoners with engine fumes in a camouflaged bread van while on the drive out to the mass graves at Butovo, where the prisoners were subsequently buried. According to Aleksandr Solzhenitsyn:
I. D. Berg was ordered to carry out the decisions of the NKVD troika of Moscow Oblast, and Berg was decently carrying out this assignment: he was driving people to the executions by shooting. But, when in Moscow Oblast there came to be three troikas having their sessions simultaneously, the executioners could not cope with the load. Then the solution was thought about: to undress the victims naked, to tie them up, plug their mouths and throw them into a closed truck, disguised from the outside as a bread van. During transportation the fuel gases came into the truck, and when delivered to the farthest [execution] ditch the arrestees were already dead.
However, according to historian Lydia Golovkova, Berg denied that he was inventor of the gas van, and his authorship has never been proven. The work of historian Vatlin also makes no connection between Berg and the gas van 
Use in Nazi Germany
During trips to Russia in 1941, Heinrich Himmler learned the psychological impact on the Einsatzgruppen killers posed by the shooting of women and children. Hence, he commissioned Arthur Nebe to explore ways of killing that were less stressful for the killers. Nebe's experiments eventually led to the production of the gas van. This vehicle had already been used in 1940 for the gassing of East Prussian Pomeranian mental patients in Soldau, a camp located in the former Polish corridor. One application by the Nazis gas van became known in 1943 after the trial of members of crimes against humanity committed in the territory of the Krasnodar Territory of the USSR, where about 7,000 civilians were killed by gas poisoning. It was a vehicle with an airtight compartment for victims, into which exhaust gas was piped while the engine was running. As a result, the victims were gassed with carbon monoxide, resulting in death by the combined effects of carbon monoxide poisoning and suffocation. The suffocations usually occurred as the gas van was carrying the victims to a freshly dug pit or ravine for mass burial.
Gas vans were used, particularly at Chełmno extermination camp, until gas chambers were developed as a more efficient method for killing large numbers of people. There were two types of gas vans in operation, used by the Einsatzgruppen in the East. The Opel-Blitz, weighting 3.5 tons, and the larger Saurerwagen, weighing 7 tonnes. In Belgrade, the gas van was known as "Dušegupka" and in the occupied parts of the USSR similarly as "душегубка" (dushegubka, literally (feminine) soul killer/exterminator).
The use of gas vans had two disadvantages:
- It was slow—some victims took twenty minutes to die.
- It was not quiet—The drivers could hear the victims' screams, which they found distracting and disturbing.
By June 1942 the main producer of gas vans, Gaubschat Fahrzeugwerke GmbH, delivered 20 gas vans in two models (for 30-50 and 70-100 individuals) to Einsatzgruppen, out of 30 ordered. Not one gas van was extant at the end of the war. The existence of gas vans first came to light in 1943 during the trial of Nazi collaborators involved in the gassing of 6,700 civilians in Krasnodar. The total number of gas van gassings is unknown.
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- The Development of the Gas-Van from the Jewish Virtual Library
- Film: Short explanation about the Gas vans at the Nuremberg trials (USHMM)
- NAZI GAS VANS By Rob Arndt
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