Wormholes as a cure for black hole singularities
  Using exactly solvable models, it is shown that black hole singularities in different electrically charged configurations can be cured. Our solutions describe black hole space-times with a wormhole giving structure to the otherwise point-like singularity. We show that geodesic completeness is satisfied despite the existence of curvature divergences at the wormhole throat. In some cases, physical observers can go through the wormhole and in other cases the throat lies at an infinite affine distance. 
Gonzalo J. Olmo, Diego Rubiera-Garcia, Antonio Sanchez-Puente
gr-qc