What did the center of the nuclear test site - the city of Kurchatov look like? Real life footage

Moscow - 400, Semipalatinsk - 21, Konechnoye station - all these are the former names of Kurchatov, a classified city that appeared in Kazakhstan almost immediately after the end of World War II. Only a few people knew about its existence. It was impossible to find it on the map. Scientists lived in the ghost town. They were conducting nuclear tests.