  The gSeaGen framework has been upgraded to simulate events detectable in
neutrino telescopes induced by neutrino or cosmic ray interactions. The new
version is well-suited to generate neutrino interactions at energies from a few
MeV to EeV, profiting from the latest GENIE extensions to lower and higher
energies. In addition, a brand new functionality to propagate leptons from
CORSIKA air showers has been developed. Novel features of gSeaGen will be
presented, related to simulation of PeV tau neutrinos and charged lepton
propagation, using the KM3NeT detectors as physics case.
