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In this paper we argue that a firewall is simply a manifestation of an inconsistent truncation of non‐perturbative effects that unitarize the semiclassical black hole. Namely, we show that a naive truncation of quantum corrections to the Hawking spectrum at order    O  (   e   −  S    )   , inexorably leads to a “localised” divergent energy density near the black hole horizon. Nevertheless, in the same approximation, a distant observer only sees a discretised spectrum and concludes that unitarity is achieved by    O  (   e   −  S    )    effects. This is due to the fact that instead, the correct quantum corrections to the Hawking spectrum go like    O  (   g   t  te   −  S    )   . Therefore, while at a distance far away from the horizon, whereg   t  t    ≈  1   , quantum corrections  are  perturbative, they  do  diverge close to the horizon, whereg   t  t    →  ∞   . Nevertheless, these “corrections” nicely re‐sum so that correlations functions are smooth at the would‐be black hole horizon. Thus, we conclude that the appearance of firewalls is just a signal of the breaking of the semiclassical approximation at the Page time, even for large black holes.

Firewalls as artefacts of inconsistent truncations of quantum geometries