In the III region of the maximally extended Schwarzschild solution, described in the Kruskal coordinates , Sch. time runs in the reversed direction as compared to the I - event horizon III-II of the photon from III is at the past infinity, while the III-IV is at the future infinity. This is refered to as a ``mirror wormhole''
I have seen that this is sometimes interpreted as if the both I and III have the same time direction? How so?
Does this means that the future singularity of the photon emitted in I is the past singularity of the photon emitted in III? Vice versa, is the past singularity of the photon from I future singularity of the photon in III. In other words, do Black Hole and White Hole exchange position between I and III?