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[OngBonga]

Nothing can be observed beyond an event horizon

This interests me a great deal. I'm not convinced it's 100% true. For example, let's say you're inside a black hole, and it nearly collides with another. Can you know there is another black hole beyond your event horizon? Well, actually, yes, I think so, because each black hole effects the spin of the other. This is how black holes slowly lose their energy, according to my understanding (which may well be very flawed) of Hawkins' ideas. If you can see that your black hole is losing x amount of spin at x rate, you might be able to determine that your black hole is close to another black hole.

Of course, I have no idea if this is true. It's just my interpretation of Hawkins' ideas. But it demonstrates, to me, that the concept we cannot observe beyond an event horizon is perhaps flawed.