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