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If you will excuse my pedantry, that's a hypothesis, not a theory. :) The truth is, we have absolutely zero evidence or indication as to what goes on inside a black hole - so the wild speculation will keep coming!

yeah... it's a hypothesis. I wonder, though, if we will ever know!

I highly doubt it! But who knows?

It would have to be a rotating black hole, and you would have to manage to travel through the center of the ring singularity. This journey would probably destroy everything but a fundamental particle.