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