The largest mass of corium in the world ate through a concrete floor and is sitting in the basement of the Chernobyl reactor right now. If you spent minutes in the room with it you will most likely die.
Also, I added a new segment to the end of this episode so listen until the end or skip to the end if you want to hear that.
Blog: https://acunit.home.blog/2022/03/30/the-elephants-foot/