Conversation so far:
what are the short term effects of the chernobyl disaster
The immediate and short-term effects of the Chernobyl disaster include radiation sickness and cataracts.
what are the long term effects of the chernobyl
Late effects of exposure to the Chernobyl disaster are thyroid cancer, especially in children and adolescents, and leukaemia among exposed workers.
when did the chernobyl disaster occur
The Chernobyl disaster was a nuclear accident that occurred on Saturday 26 April 1986, at the No. 4 nuclear reactor in the Chernobyl Nuclear Power Plant

Question: how severe was the disaster
Self-contained rewrite: how severe was the chernobyl disaster