The remains of some 500 victims have been found, many showing gunshot wounds and evidence of torture.
Other detainees are said to have died of malnutrition and disease.
Some 64 state investigators and research volunteers are currently working at the gruesome and long-suspected site, which is part of a sinister infernal camp system called Dulag-191 in the Voronezh region.
Poignant video footage shows diggers digging up skulls and body parts in an area occupied by Hitler’s forces during World War II.
“The estimated death toll is around 500,” said Mikhail Segodin, head of Don’s research volunteer team, referring to this specific mass burial.
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“The main contingent of the camp was made up of women and children”
Records suggest that in total some 8,500 people perished at Dulag-191, he said.
The current search for human remains is focused on 15 graves – mass graves each containing between 30 and 100 remains near the village of Lushnikovo, Ostrogozhsky district.
“Judging by the remains unearthed so far, we see gunshot wounds, blunt trauma, in other words, broken bones,” Segodin said.
“The site is complicated because it was a camp for women and children.
The human remains are in poor condition, he said.
Mr Segodin added: “Most of the tubular bones have survived, but often only teeth from the skulls remain.
“The only thing that can be said for sure is that almost all of the people who died here were young.
“We did not find any valuables, other than possibly a cigarette case damaged by gunfire. “
A Soviet intelligence report dated September 2, 1942 from the Office of the People’s Commissariat for Internal Affairs of the Voronezh region stated that “a concentration camp for women and children is located in a brickyard in the suburban village of Lushnikovka.”
The camp was described as being “in the open, fenced in with four rows of barbed wire” and it was “guarded by Magyars” [Hungarians].
The report stated: “Prisoners are not fed, but children are allowed to give alms, parcels are also allowed.
“There are a lot of sick people there, medical help is not provided.
“There is a high death rate. “
Intelligence documents also suggested the murder of children and cruelty to prisoners of war.
Local historian Viktor Strelkin spoke with eyewitnesses and surviving prisoners.
“I was told that in these pits, right under the feet of people still alive, lay the dead.
“Sometimes they would lie in the open, or they were covered with 10 or 15 centimeters of earth, but it sagged and the corpses were visible again. “
Segodin said: “Research and identification will continue with specialists from the (Russian) commission of inquiry.”
The Dulag-191 concentration camp system was established in the Voronezh region in 1942.
Dulag-191 detainees were forced to build a railway for the Nazis known as the Berlinka Line, built to supply German forces seeking to take Stalingrad.
The burial was found thanks to unclassified secret service documents and aerial photographs taken by a German pilot in 1942.
This established the exact location of the women’s and children’s camp