Watch this documentary and take good notes, be sure the following things are included: when, where and why it occurred. How many people tried to clean it up, what they had to do, how many people were harmed (both initially and long term). What physical harm it caused people and how politicians initially handled the situation. How did they seal it and are there any issues with the way it was sealed?
Here' the link: If something happens and it doesn't work, google it, it's called
Chernobyl Uncensored Documentary
https://www.youtube.com/watch?v=2FOoooFsFdUFor after, 4 minutes: https://www.youtube.com/watch?v=n7aMcKinrWY
