Laboratory B (Russian: Лаборатория Б), also known as Object B (Объект Б) or Object 2011 during its period of operation,[1][2][3][4] was a former Soviet nuclear research site constructed in 1946 by Lake Sungul in Chelyabinsk Oblast in Russia.[citation needed] Operated under the 9th Chief Directorate of the Soviet Ministry of Internal Affairs, it was a major site for the Soviet program of nuclear weapons that works on handling, treatment, and the use of the radioactive products generated in reactors, as well as radiation biology, dosimetry, and radiochemistry. It had two divisions: radiochemistry and radiobiophysics; the latter was headed by N. V. Timofeev-Resovskij.
Laboratory B was run as a sharashka—a secret facility run as a prison, with at least ten of its German staff classified as prisoners of war from World War II. For two years, the German chemist Nikolaus Riehl was the scientific director.
It was closed in 1955, and has since been abandoned and left as a ruin.