This report presents a feasibility study aimed to use an innovative instrumentation for the measurement and real-time monitoring of the vertical deformations of the sea floor, which will be integrated in the MEDUSA permanent marine infrastructure installed in the Gulf of Pozzuoli, the submerged part of the Campi Flegrei caldera. The instrumentation consists of a Digital Profile Gauge, which is currently owned by ENI S.p.A. (Italy) in the framework of the agreement between these and INGV. The digital profile gauge consists of a flexible hydraulic circuit containing several pressure sensors, which measure the difference in pressure between one of these and another one used as reference point. This difference is proportional to their relative vertical displacement. The characteristics of...