The second episode of Chernobyl was very interesting in that we were able to see what the outcomes of the reactor exploding were, and how the Russian government tried to cover the situation up while also look for a solution.
They ended up using sand and boron to cover the plant, which assumed that there was no water in the tanks below, but there was water and if the boron/sand lava hit the tanks it would create a radioactive explosion. That must have been super stressful — dropping the ball twice in that way, with so many people at stake — is crazy.