Creating a New Kind of Universe in a Black Hole

We don't know if our universe is bounded wild. Some of our theories of cosmology suggest that it should be infinite. It would be most natural if it were infinite, but we just don't know that. The portion of the universe we can see now is about 93 billion light years wide. And we also know that our universe is expanding, and the mechanism for that is totally unexplained. So it is possible that our entire universe is inside some like mega black hole that's just unimaginably wide,. In our universe, or basically any universe, whenever there's a black hole, it's sort of creating a whole new kind of universe.