Pavlopetri, Oldest Underwater City
The city of Pavlopetri, underwater off the coast of southern Laconia in Peloponnese, Greece, is about 5,000 years old, and is the oldest submerged archeological town site. It is unique in having an almost complete town plan, including streets, buildings, and tombs. It has at least 15 buildings submerged in 9.8–13 ft of water.
The ruins were dated to the Mycenaean period, 1600-1100 BC. Later studies showed an older occupation date starting no later than 2800 BC, so it also includes early Bronze Age middle Minoan and transitional material. It is now believed that the town was submerged around 1000 BC by the first of three earthquakes that the area suffered
The city of Pavlopetri is part of the underwater cultural heritage as defined by the UNESCO in the UNESCO Convention on the Protection of the Underwater Cultural Heritage.