That is a leftover after Kyshtym disaster (Кыштымская авария), which is relatively well documented even though it is not well known in the west. City-40 is the

That is a leftover after Kyshtym disaster (Кыштымская авария), which is relatively well documented even though it is not well known in the west. City-40 is the name of the movie about the city, city was named Chelyabinsk-40 (Челябинск-40) at the time of the incident. >so much nuclear waste that it evaporated entirely from the heat. That's just bs.