The results of a geophysical survey of the technical condition of the lighthouse are presented. The stressstrain state, the residual resource, the tension of the fastening cables, the fixation of piles in the ground (rigid/non-rigid), and the immersion depth of the historical study object, the Sukhumi Lighthouse built in 1861 were determined. The passive seismic standing method based on the extraction of the natural vibrations of the object from noise records, as well as the tapping method, based on the recording of a reflected seismic wave passing along the structure were used to solve the above problems.