Geo4Sight is an in-ground wireless monitoring IoT platform that by detecting angular movement, pore pressure and temperature reveals subsurface activities well before they are visible on the surface. Equipped with inclinometers and accelerometers, Geo4Sight detects early warning signs for hidden fault lines, rock bridge ruptures, deformation, and landslides. Pore pressure sensors monitor phreatic flow and liquefaction, while timestamped RFID marker detection is invaluable for ore tracking.