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Black hole physics gets down to the real nitty gritty, edges of what we know about physics. And of course that's why it attracts the top theoreticians because it's a chance to make that breakthrough. You're going to unknown territory. There are suggestions that this speed limit on communication and transport, the speed of light, you can't go faster than the speed of light and you can't send information faster than the speed of light. But the physics of black hole suggests, although it's still uncertain, that there may be other ways to send information using the physics of black holes or using black holes themselves. That might imply there's some practical way to take advantage of that.

And if you have truly advanced civilizations in the galaxy, and you might, remember, we're the new kids on the block. The Earth has been here four or five billion years, but the galaxy's been here at least twice that long. So there may be some civilizations that are very, very much more advanced than we are. They may be taking advantage of that, and it may be that we're sitting around with our radio receivers hoping to get signals and all the really interesting traffic is being communicated in a way that we're not yet aware of.