It is thought that there is another universe beyond the singularities of black holes. Is it because width of the light cones become zero at the singularity, meaning that you can cross infinite distance in a moment?
Also, is it the same 'other universe' as the regions 3 and 4 (white hole) of the Kruskal Diagrams? In that diagram region 4 seems not connected to r = 0 line of region 2 (singularity), and we seem to travel directly from 1 to 3 without ever encountaring any singularity if we travel at FTL speed. In short, is the hypothetical other universe behind the singularity same as the one in an Einstein Rosen Bridge?