Laboratory B in Sungulʹ

Laboratory B (Russian: Лаборатория Б), also known as Object B‌ (Объект Б) or Object 2011 during its period of operation, was a Soviet nuclear research site constructed in 1946 at Lake Sungulʹ in Chelyabinsk Oblast. It operated under the 9th Chief Directorate of the MVD and contributed to the Soviet nuclear weapons program and was responsible for the handling, treatment, and use of 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.