  We point out that for a range of parameters, the flux of DM may be stopped
significantly by its interactions with the Earth. This can significantly
degrade the sensitivity of direct detection experiments to DM candidates with
large interactions with terrestrial nuclei. We find that a significant region
of parameter space remains unconstrained for DM $\lesssim $ a few GeV. For DM
candidates with moderate levels of stopping power, the flux of DM may be
blocked from below but not above a detector thereby producing a novel daily
modulation. This can be explored by low threshold detectors placed on the
surface or in shallow sites in the south hemisphere.
