  Quantum gravity may allow black holes to tunnel into white holes. If so, the
lifetime of a black hole could be shorter than the one given by Hawking
evaporation, solving the information paradox. More interestingly, this could
open to a new window for quantum-gravity phenomenology, in connection with the
existence of primordial black holes. We discuss in particular the power of the
associated explosion and the possibility to observe an astrophysical signal in
the radio and in the gamma wavelengths.
