Thats a hard question! A black hole isn’t really a hole as such, it is an extremely dense dead star that attracts all matter (things in the universe). At it’s center, a point of singularity, all the matter that falls into the black hole is compressed into this infinitely small sized place and will just sit there for a very long time. So I guess you could say that at the ‘bottom’ of a black hole, we find all this compressed matter that the black hole has sucked in. Hope that helps
