The interior of a black hole is clearly a separate universe in itself, or at least separated from our universe. By it's nature nothing can escape, aside of virtual particle pairs,
Our universe has cosmic horizon we can never see beyond, effectively an event horizon, and the whole thing supposedly came from an infinitely dense point, ie a singularity.
How do we know that the expansion of space is not a result of being inside a self contained black hole, sucking in space and matter and depositing it all equally everywhere in our universe, ie dark energy? Inflation could very well have been the first large object the singularity consumed after it had formed. I also think dark matter is "simply" compressed space in which matter sits in. Matter curves space and gives us gravity. I think dark matter is just curved space without matter. We're trying to find something that isn't there, its just deformations of space and that's that. Matter matter sits comfortably in it like water sitting in a crumpled up tarpaulin after it rains.
I'm pretty convinced that's what's going on in our universe, and it will end in much the same way as hawking radiation leaks out until the singularity is no more. It will just fizzle away until the infinite density becomes finite again, which from our interior perspective will see everything racing apart until even atomic structure expands apart.