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Persistent rumors of her possible escape circulated after her death, fueled by the fact that the location of her burial was unknown during the decades of Communist rule. The abandoned mine serving as a mass grave near Yekaterinburg which held the acidified remains of the Tsar, his wife, and three of their daughters was revealed in 1991. These remains were put to rest at Peter and Paul Fortress in 1998. The bodies of Alexei Nikolaevich and the remaining daughter—either Anastasia or her older sister Maria—were discovered in 2007. Her purported survival has been conclusively disproven. Scientific analysis including DNA testing confirmed that the remains are those of the imperial family, showing that all four grand duchesses were killed in 1918.