A rusty road sign is seen outside the perimeter of a Nazi death camp in Sobibor September 18, 2014. 
 
 A rusty road sign is seen outside the perimeter of a Nazi death camp in Sobibor September 18, 2014. 
 
 A recently uncovered well, used by the prisoners in Camp 1, is seen in the perimeter of a Nazi death camp in Sobibor September 18, 2014.. 
 
 A golden ring inscriptioned in Hebrew is shown after being discovered in the perimeter of a Nazi death camp in Sobibor September 18, 2014. 
 
 A medallion in the shape of the Star of David is shown after being discovered in the perimeter of a Nazi death camp in Sobibor September 18, 2014. 
 
 Recently uncovered bricks of a former gas chamber are seen inside the perimeter of a Nazi death camp in Sobibor September 18, 2014. 
 
 Recently uncovered bricks of a former gas chamber are seen inside the perimeter of a Nazi death camp in Sobibor September 18, 2014. 
 
 Recently uncovered bricks of a former gas chamber (bottom) are seen inside the perimeter of a Nazi death camp in Sobibor September 18, 2014. 
 
 SOBIBOR Poland Archaeologists working at the site of the Nazi concentration camp at Sobibor, in eastern Poland, say they have uncovered previously-hidden gas chambers in which an estimated quarter of a million Jews were killed. 
 
 German forces tried to erase all traces of the camp when they closed it down following an uprising there on Oct. 14, 1943. The Nazis demolished the gas chambers and an asphalt road was later built over the top. 
 
 Archaeologists excavated beneath the road and found lines of bricks, laid four deep, where they believe the walls of the gas chambers used to stand. 
 
 They have been able to establish how big the chambers were, information they said would help build up a more precise picture of how many people were murdered at the camp. 
 
 "Finally, we have reached our goal -- the discovery of the gas chambers. We were amazed at the size of the building and the well-preserved condition of the chamber walls," said Yoram Haimi, one of the archaeologists. 
 
 Haimi said two of his own uncles, who had been living in Paris during the war and were rounded up by the Germans, were among those who were killed at Sobibor. 
 
 The archaeologists said among the personal items they had come across buried in the ground near the gas chambers was a wedding ring which carried the inscription, in Hebrew: "Behold, you are consecrated unto me." 
 
 EVIDENCE DESTROYED 
 
 Historians say that because the Germans razed the camp, and because so few of those detained there came out alive to give testimony, there is less information about how Sobibor operated and the scale of the killing than there is for some other concentration camps. 
 
 Polish archaeologist Wojciech Mazurek, who has also been involved in uncovering the site, said the excavations revealed there were eight gas chambers. 
 
 "The extermination of people took place there; murder by smoke from an engine that killed everyone within 15 minutes in these gas chambers, in torment, shouting," he told Reuters Television. 
 
 "It is said that ... the Nazis even bred geese in order to drown out these shouts so that prisoners could not have heard these shouts, these torments." 
 
 According to Israel's Yad Vashem International Institute for Holocaust Research, the 1943 uprising was organized by Jewish civilians at the camp and Jewish officers in the Soviet army who had been taken prisoner and sent to Sobibor. 
 
 About 300 people escaped, but most were caught and killed. Those who did not take part in the break out were also killed. At the end of World War Two, about 50 escapees were left alive. 
 
 The research project at Sobibor is being carried out in coordination with the Israeli-based Yad Vashem International Institute for Holocaust Research, the German-Polish Foundation, and the Majdanek State Museum, near the Polish city of Lublin. 
 
 (Additional reporting by Robert Furmanczuk and Michal Ratynski; Writing by Christian Lowe; Editing by Crispian Balmer) ||||| Archaeologists believe they have discovered the exact location of gas chambers at Sobibor, an extermination camp that was destroyed by the Nazis to cover up evidence of their crimes. 
 
 More than 250,000 Jews were killed at the Sobibor death camp in what is now Poland. The SS leader Heinrich Himmler ordered Sobibor to be destroyed after a successful prisoner uprising in which around 300 of those being held there escaped. He ordered all traces of the camp to be removed, and the area planted with trees. 
 
 "The whole former camp is one huge crime scene," said Tomasz Kranz, the director of Poland's Majdanek Museum, which is responsible for a memorial at the site. 
 
 After an eight-year investigation, Polish and Israeli archaeologists believe they have finally unearthed the remains of a brick building that housed the gas chambers in which 500 people at a time were murdered. 
 
 The building's true purpose was disguised by a sign that read "baths", with fake shower heads fastened to the ceiling, according to witness accounts. 
 
 The rooms were locked with steel doors equipped with peep-holes. It took just 20 to 30 minutes to murder each group of victims. 
 
 "These finds are all that remained of those who were murdered here," one of the archaeologists told Süddeustche Zeitung newspaper. "We will learn more from them on how the murder in the camp was carried out and what the Jews went through before they were murdered." 
 
 There was no chance of survival for those sent to Sobibor. Unlike other concentration camps such as Auschwitz, prisoners were not kept alive to work as forced labourers: they were all sent to the gas chambers. The camp was built expressly for the purpose of carrying out the Holocaust, and the overwhelming majority of those who died there were Jewish. 
 
 Jewish slave labourers were forced to build the camp, and shot dead the moment it was completed. 
 
 Jewish prisoners led an uprising at the camp on October 14 1943, in which they killed 11 SS officers and a number of camp guards. 
 
 Some 300 of the 600 prisoners in the camp at the time escaped, but only 50 to 70 of them are believed to have survived. Others died in the minefields that surrounded the camp, or were recaptured in the days that followed.
– After seven years of searching, archaeologists digging in Poland have found the exact location of the Sobibor death camp's gas chambers. Less had been known about this concentration camp's chambers, which were razed by the Nazis along with the rest of the site following a prisoner uprising in 1943, the Jerusalem Post reports. A road was later built over the camp's remains, and archaeologists searching beneath it uncovered rows of bricks that they believe demarcate what one archaeologist involved in the dig says were eight chambers, Reuters reports. "We were amazed at the size of the building and the well-preserved condition of the chamber walls," says a second archaeologist, whose relatives were killed at Sobibor. Being able to determine the size of the chambers is a big win for researchers, who say it will enable them to more accurately determine how many people were killed at the camp; current estimates put the figure at 250,000. As the Telegraph explains, Sobibor was not a work camp like, for example, Auschwitz; all prisoners who arrived here were sent to the gas chambers. As such, few survivor stories exist. In addition to the chambers, a well containing prisoners' personal items discarded by the Nazis was also found. The archaeologists also surfaced a wedding ring bearing a Hebrew inscription reading, "Behold, you are consecrated unto me." (There was another very significant find at Sobibor this summer.)