the Gulf of Corinth. Edgerton perfected special sonar equipment for this research but permission to search was not granted by the Greek authorities. In 1967 and in 1976, Jacques Cousteau made some efforts with no result. In 1979 in the Corinthian Gulf, the Greek undersea explorer Alexis Papadopoulos discovered a sunken town and recorded his findings in a documentary film which shows walls, fallen roofs, roof tiles, streets, etc. at a depth of between 25 and 45 m. "Whether or not this town can be identified with Helike is a question to be answered by extensive underwater research. In any case, the discovery of this town can be regarded as an extremely interesting find", according to the Greek scientific journal Archaeology. Rediscovery In 1988, the Greek archaeologist Dora Katsonopoulou, president of the Helike Society, and Steven Soter of the American Museum of Natural History launched the Helike Project to locate the site of the lost city. Ancient texts, telling the story of Helike, said that the city had sunk into a poros, which everyone interpreted as the Corinthian Gulf. However, Katsonopoulou and Soter raised the possibility that poros could have meant an inland lagoon. If an earthquake caused soil liquefaction on a large scale, the city would have been taken downward below the sea level. Also, if an earthquake caused the sections of coastline to fall into the sea, this would have created a tsunami, which in turn would have flooded the inland lagoon with the city in it. Over time, the river sediment coming down from the mountains would have filled in the lagoon hiding the city remains beneath the solid ground. Before Helike was rediscovered, a few false starts came along the way. In 1994, in collaboration with the University of Patras, a magnetometer survey carried out in the midplain of the delta revealed the outlines of a buried building. This target (now known as the Klonis site) was excavated and a large Roman building with standing walls was found. Also a well-preserved settlement of the early Bronze Age was uncovered. Finally, in 2001, the city of Helike was rediscovered buried in an ancient lagoon near the village of Rizomylos. To further confirm that the discovered site belongs to Helike, the earthquake destruction layer consisting of cobblestones, clay roof tiles, and pottery was uncovered in 2012. This destruction layer is in good agreement with ancient texts on the