  In this talk we discuss aspects of TeV-scale gravitational collapse to black
holes and string balls and their subsequent evaporation. Special emphasis is
placed on the interplay of the string/black hole correspondence principle.
These ideas are then explored in the context of cosmic ray physics. First, the
potential for observing showers mediated by black holes or superstring
excitations is examined. Next, existing data from neutrino telescopes are used
to constrain the parameter space for the unseen dimensions of the universe.
Finally, we close with a discussion of future prospects.
