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Above a critical dark matter-nucleus scattering cross section any terrestrialdirect detection experiment loses sensitivity to dark matter, since the Earthcrust, atmosphere, and potential shielding layers start to block off the darkmatter particles. This critical cross section is commonly determined bydescribing the average energy loss of the dark matter particles analytically.However, this treatment overestimates the stopping power of the Earth crust.Therefore the obtained bounds should be considered as conservative. We performMonte Carlo simulations to determine the precise value of the critical crosssection for various direct detection experiments and compare them to other darkmatter constraints in the low mass regime. In this region we find parameterspace where typical underground and surface detectors are completely blind todark matter. This "hole" in the parameter space can hardly be closed with anincrease in the detector exposure. Dedicated surface or high-altitudeexperiments may be the only way to directly probe this part of the parameterspace.

How blind are underground and surface detectors to strongly interacting Dark Matter?