Stephen Hawking thinks this might be possible. The problem with such speculations, no matter how well founded, is that we will never know. The nearest black hole is 6000 light years away! We can never look inside a black hole to see what is going on, and we can never look 'behind' it to see what comes out in some other dimension.

Since there is no experiment we can conduct to test this hypothesis, some scientists would argue that it is not a scientifically interesting question, no matter how compelling it seems to us. If you cannot test an idea, it is not a scientific one, no matter what its parentage.

It is most curious and most unfortunate that perfectly good scientific theories can seemingly force us to address unscientific questions whose answers are both beyond our technological grasp, and in some cases are beyond answers available to us within our very own space-time continuum!

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