  We consider collision of two particles 1 and 2 near the horizon of the
extremal rotating axially symmetric neutral generic black hole producing
particles 3 and 4. We discuss the scenario in which both particles 3 and 4 fall
into a black hole and move in a white hole region. If particle 1 is fine-tuned,
the energy $E_{c.m.}$ in the centre of mass grows unbounded (the
Ba\~{n}ados-Silk-West effect). Then, particle 3 \ can, in principle, reach a
flat infinity in another universe. If not only $E_{c.m.}$ but also the
corresponding Killing energy $E$ is unbounded, this gives a so-called
super-Penrose process (SPP). We show that the SPP\ is indeed possible. Thus
white holes turn out to be potential sources of high energy fluxes that
transfers from one universe to another. This generalizes recent observaitons
made by Patil and Harada for the Kerr metric. We analyze two different regimes
of the process on different scales.

General Relativity and Quantum Cosmology;High Energy Astrophysical Phenomena;High Energy Physics - Theory