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Particle collisions in black hole ergoregions may result in extremely highcenter of mass energies that could probe new physics if escape to infinity werepossible. Here we show that some geodesics at high inclinations to theequatorial plane may be unbound. Hence a finite flux of annihilation debris isable to escape, especially in the case of near-extremal Kerr black holes and ifthe Penrose process plays a role. For a class of Penrose processes, we showthat the Wald inequalities are satisfied, allowing the Penrose process to havea key role in high energy ejection. Hence the possibility of observing newphysics effects from a black hole accelerator at unprecedentedly high particlecollision energies remains a tantalizing, if futuristic, experimental vision.

Unbound geodesics from the ergosphere and potential observability of debris from ultrahigh energy particle collisions