Pianosa Boa 2 is a guided boat dive in front of Pianosa's historic harbor, where Buoy 2 marks the mooring point for submerged rocks rising through Posidonia meadows. The site combines a low-relief seabed with resident groupers and seasonal schools of snapper, barracuda, and tuna, making it a fish-rich marine-park dive rather than a dramatic wall. Access is tightly regulated, but the summer water is usually clear and the underwater scenery is classic Pianosa.