Gavi is a boat-access cliff-and-cave dive off Ponza with passages, small caves, and a long oblique cave that leads into a dark chamber. The route suits scuba exploration rather than casual wandering: current can bring larger pelagics into view, and the overhead section calls for disciplined buoyancy and turn-point awareness. False coral, sea anemones, eels, and schooling fish keep the site lively when conditions are calm enough to enjoy the rock features.