  Two dimensional disordered superconductors with broken spin-rotation and
time-reversal invariance, e.g. with p_x+ip_y pairing, can exhibit plateaus in
the thermal Hall coefficient (the thermal quantum Hall effect). Our numerical
simulations show that the Hall insulating regions of the phase diagram can
support a sub-phase where the quasiparticle density of states is divergent at
zero energy, \rho(E)\sim |E|^{1/z-1}, with a non-universal exponent $z>1$, due
to the effects of rare configurations of disorder (``Griffiths phase'').
