In this talk I investigate the
"firewall argument", that claims that black hole horizons can
not be smooth.
a holographic model of the black hole horizon as a quantum mechanical
membrane, I show how
recover the black hole interior as an emergent
smooth region of space-time. The reconstruction makes
of the formalism of quantum error correcting codes. I explain
why the horizon of very old black holes
to be singular, and formulate a complementarity principle that resolves
this firewall paradox.