Thanks, I should have perhaps been more accurate - I was talking about a shell of event horizons with the singularities not touching each other. Presumably, the outside universe would see just a big event horizon?
How would this Physics work do you think? From the inside of the shell there is complete disconnection from the universe. From the outside of the shell it appears that lots of new matter has arrived from nowhere. I Know it is unstable but think about the instant when it is still a shell.