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Classical black holes shield us from the singularities that inevitably appearin general relativity. Being singularity regularization one of the mainlandmarks for a successful theory of quantum gravity, quantum black holes arenot obliged to hide their inner core from the outside world. Notwithstandingthe aforesaid, it is often implicitly assumed that quantum gravity effects mustremain confined to black hole interiors. In this essay we argue in the oppositedirection, discussing theoretical evidence for the existence of strongcorrelations between the physics inside and outside non-singular black holes.We conclude that astronomical tests of the surroundings of black holes canprovide invaluable information about their so-far unexplored interiors.

Hearts of Darkness: the inside out probing of black holes