  We study the signal for the detection of quasi-stable supersymmetric
particles produced in interactions of cosmogenic neutrinos. We consider energy
loss of high energy staus due to photonuclear and weak interactions. We show
that there are optimal nadir angles for which the stau signal is a factor of
several hundred larager than muons. We discuss how one could potentially
eliminate the muon background by considering the energy loss of muons in the
detector. We also show results for the showers produced by weak interactions of
staus that reach the detector.
