In this paper the possibility to construct wireless sensor networks buried in the terrain is discussed. Advantages and drawbacks are pointed out, and an analysis of the most efficient method to evaluate the effect of radio-link parameters on radio propagation is provided. As it is unsuitable for fixed monitoring applications, because of the need to power the equipment, this technological solution may become effectively convenient, when the sensor is mobile and its permanence in the ground is time-limited. For all these reasons, the solution becomes attractive, applied to detect breaks and reveal unknown tracks in water distribution networks, monitoring the pressure of the fluid flowing in the pipe and tracking the path of the sensor through the conduits.