Is There a Singularity at the Heart of a Black Hole?

We know that our universe started with a singularity. That's this crazy, dense moment when the universe was infinitely dense and then expanded rapidly. The idea is that maybe inside black holes we have this region of expanding space time, begin with an infinite density just like our universe. And so it's sort of like this bounce, a moment where it collapses into a singularity and then starts expanding out again, expanding, but still inside of the black hole. It's lke a little bubble inside of theBlack Hole ofre space.