Pavel Otdelnov at the exhibition ``Zvenyashchiy Sled`` (The Ringing Trace) in the village of Sokol, Chelyabinsk Oblast, Russia, on September 11, 2021. The art project is dedicated to the history of the Soviet nuclear program, the secret Laboratory ``B,`` and the first radiation accident in the USSR in 1957 at the Mayak chemical plant. (Photo by Maxim Konankov/NurPhoto) (Photo by Maxim Konankov / NurPhoto via AFP)