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It is widely expected that generic black holes have a non-empty but weaklysingular Cauchy horizon, due to mass inflation. Indeed this has been proven bythe author in the spherical collapse of a charged scalar field, under decayassumptions of the field in the black exterior which are conjectured to begeneric. A natural question then arises: can this weakly singular Cauchyhorizon close off the space-time, or does the weak null singularity necessarily"break down", giving way to a different type of singularity? The main result ofthis paper is to prove that the Cauchy horizon cannot ever "close off" thespace-time. As a consequence, the weak null singularity breaks down andtransitions to a different singularity for which the area-radius $r$ extends to$0$.

The breakdown of weak null singularities inside black holes