is carried out from behind the coastline and directed towards the sea crossing predetermined submerged productive strata in the boreholes drilled tubular drains are introduced with grooves or holes only in stretches that correspond to predicted productive areas remaining closed in the other sections the space between the hole and the drain is sealed in the non productive parts application_number US 66601804 A description the procedure of the invention comprises after the appropriate hydrological and geotechnical studies of the viability and site of the productive sections or regions the guided horizontal drilling ghd of one or more boreholes from the land in a zone close to the coastline and directed towards the sea passing through zones expected to provide sufficient permeability both because of porosity and because of fracturing to ensure at all times the replenishing of the marine aquifer to be exploited and until reaching the seabed in a final slightly upward section the ghd system allows the drill head to be guided to drill very long holes more than 600 m within the strata of the productive aquifer this technology allows holes to be drilled from the land which come out in the sea without affecting the intermediate section for the localization of the drill head magnetic navigation systems are used with a localization precision of the order of centimeters allowing the guiding of the borehole to achieve optimum objectives this part of the process is known as pilot drilling after pilot drilling the.