"Vozrozhdeniya, also known as Rebirth Island (Russian: Остров Возрождения, Ostrov Vozrozhdeniya), was a former island of the Aral Sea or South Aral Sea. Due to the ongoing shrinkage of the Aral, it became first a peninsula in Mid 2001 and finally part of the mainland. Since the disappearance of the Southeast Aral in 2008, Vozrozhdeniya effectively no longer exists as a distinct geographical feature. The area is now shared by Kazakhstan and Uzbekistan.
Located in the central Aral Sea, Vozrozhdeniya Island was one of the main laboratories and testing sites for the Soviet Union’s Microbiological Warfare Group. In 1948, a top-secret Soviet bioweapons laboratory was established here, which tested a variety of agents, including anthrax, smallpox, plague, brucellosis, and tularemia."