Pavlopetri -- the world's oldest known submerged town

Marine geo-archaeologist Dr Nic Flemming of the National Oceanography Centre, Southampton said: "The discovery of Neolithic pottery is incredible! It means that we are looking at a port city which may be 5000-6000 years old, with trade goods and wrecks nearby showing some of the very earliest days of seafaring trade in the Mediterranean."

The project is being carried out by a multidisciplinary team, including Dr Flemming, led by Mr Elias Spondylis, Ephorate of Underwater Antiquities of the Hellenic Ministry of Culture in Greece and Dr Jon Henderson, an underwater archaeologist from the Department of Archaeology at The University of Nottingham.

The underwater city was discovered in 1967 by Flemming, then at the National Institute of Oceanography. He worked out that it was Bronze Age, about 2000 BC, and arranged the permit for a team from Cambridge University to map it properly in 1968, which they did using just snorkels and tape measures. The results were published by The British School at Athens in 1969, but no further work has been done over the last 40 years. The site was so remote that its isolation protected it from human interference, while a submerged ridge of rock protected it from erosion.

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Nic Flemming -- The curvature of the sea surface and the nearby walls is of course caused by the "fish-eye" lens. There is an obvious wall across the foreground, slightly curved, and two huge wall foundations stretching away parallel towards the diver. There are other walls branching off into the gloom to left and right. Although there are some square or flattened paving stones in the town, almost all the walls are made out of uncut stones like dry-stone sheep walls on Exmoor. They were probably packed with clay to make them stronger, as we know that some of the houses were at least two stories high later in the Bronze Age, from the paintings at Santorini. The diver is Kirsten Flemming, who was the architect-diver for the project. Credit: Pavlopetri Expedition

Now in his 70s, Flemming has joined forces with archaeologists from the University of Nottingham and the Ephorate of Underwater Antiquities of the Hellenic Ministry of Culture as part of a five-year collaborative study of the site. The survey methods include laser range-finding on the surface and high-frequency sector-scanning sonar underwater. Their initial findings, and especially the discovery of Neolithic ceramics, mean that the submerged city was occupied at least 5,000 years ago, 1,200 years earlier than previously believed, and perhaps based on a primitive settlement much earlier still. The findings have been made public by the Greek government.

"What we've got here is something which is two or even three thousand years older than most of the submerged cities which have been studied," said Flemming: "And it is uniquely complete. We have almost the complete town plan, the main streets and all of the domestic buildings. We can study how it was used as a port, where ships came in and how trade was managed."

The total town area is about 100,000 square metres, about half of which has so far been mapped. Much is still covered by sand. The team has already found a new area of ruins, measuring about 100 by 100 metres.

Flemming is running the studies of sea-level change and tectonics at the site, while colleague Dr Neil Wells of the University of Southampton's School of Ocean and Earth Science at the National Oceanography Centre and one of his students have already modelled winds and waves to work out aspects of coastal sand transport and erosion.

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This is a rectangular cist grave made by four stones standing on edge. The markings on the range pole are in 25cm bands. Credit: Nic Flemming

There is a lot more work to do in analysing the sand movements over the site, plotting various findings of submerged 'beachrock' which can be dated showing earlier shorelines now hundreds of metres offshore, and modelling the process of inundation itself.

The Hellenic Centre for Marine Research plans to provide a geophysics research boat in 2010 to measure the sub-bottom profiles to get sediment thickness in key areas around the submerged city, and confirm the position of the shoreline at different dates.

The permit runs for another four years.

Source: National Oceanography Centre, Southampton