The complete Penrose diagram for the Kerr spacetime has not one, but two inner event horizons leading to two parallel wormholes. You reach one if you embrace your fall and head down, the other if ...

Such wormholes would be impregnable for normal ... or inner anti-horizon. As its Penrose diagram shows, the (outgoing) inner anti-horizon is not the same as the (in-going) inner horizon.

On Penrose diagrams, space and time also bunch up at ... You’ve just traversed an Einstein-Rosen bridge - a wormhole. We’ll come back to the detailed physics of wormholes another time ...