The discovery was made at the site of Thonis-Heracleion – a 3, 000-year-old sunken city that was discovered in 2011 filled with artefacts and remains.... The settlement is believed to have sunk at the end of the second century BC, following a combination of earthquakes, tsunamis, rising sea levels, and soil liquefaction.... But it is still revealing its secrets as a team from the European Institute for Underwater Archaeology( IEASM), led by French marine archaeologist Franck Goddio, have enjoy