hello, in Penrose diagrams it says that once you have crossed a first Cauchy horizon(of a rotating black hole) , then, with the repulsive singularity, it is possible to cross another Cauchy horizon, and then another event horizon to escape the black hole and go into another universe. so I wonder: -since the event horizon and the Cauchy horizon of the classic black holes are similar and symmetrical, why is it possible to cross the Cauchy horizon since it is not possible to escape an event horizon? -then, how is it possible to cross the second Cauchy horizon and the second event horizon since no matter can escape the event horizon of a black hole? this seems a total non sense for me... can anyone give it some sense to me? thank you!