We bring to light the unknown sunken port of Ancient Eretria, which is only 30 meters from the modern port, but is separated by 2,400 years from it... The ancient construction along its entire length maintains a constant width (8 meters) and is located -86 cm lower than the current sea level. The original construction dates back to the beginning of the second half of the 4th century BC with some reinforcing modifications at the beginning of the 3rd century BC. century... The city owes its great flourishing to the maritime trade during the 9th and 8th BC. century. The...