Since 1967 we started employing geophysical techniques for geotechnical studies. We offer: Microgravity, VLF, P-Wave Seismic Tomography, Multichannel Analysis of Surface Waves, both active-source (MASW) or passive source (MASW-Passive, ReMi, MAM), use of high power hydraulic seismic sources, Self-Potential, Electrical Resistivity (1D, 2D, 3D, DAS), Time Domain Electromagnetics (TEM) with various sensors (fluxgate, low frequency coil, SQUID).