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1. Is it possible to have a black-hole 'inside a black-hole'?

I ask this because there is mathematical evidence to suggest the Universe is a supermassive black-hole, in which case the black-holes we observe would have to exist 'inside' it.

2. If an observer was inside a black-hole, the Universe could not exist, from that observer. Correct?

Thus on similar logic we can say a universe exists outside our own, but we would be unable to prove it.

Finally, with regard to the accelerating Universe.

Can we posit the Universe to undergo accelerating and

*decelerating*expansion consecutively, so that one cancels out the other?

This would make it so the Universe would eventually contract, fitting in with the idea of a closed black-hole.