It's said that Demetrius the Besieger, a mighty warrior king and one of Alexander the Great's successors, built this harbor on Cyprus' southern coast 2,400 years ago to thwart a potential naval invasion from the ruler of Egypt, Ptolemy I, another of Alexander's heirs.
French archaeologists who initially studied the ancient harbor of Amathus believe it to be an incomplete military fortification work, the three piers of which would have accommodated the best of the ancient world's naval ships, ready to repel an attacking force.
Lying just a few feet underwater a mere 200 feet off the coastline near the resort town of Limassol, the harbor will soon be Cyprus' newest tourist attraction where adventurous holidaymakers can snorkel over its submerged stone remains.
It's a novel direction for Cyprus' tourism authorities, who are looking beyond the east Mediterranean island nation's long-held "sun and surf" product to reach out to specialized tourism markets.
The COVID-19 pandemic has slashed tourism arrivals for an island that relies much on that revenue, so Cyprus authorities are taking a fresh look at what the island has to offer visitors, to re-ignite interest among those who do opt to travel.
Cyprus Antiquities department official Yiannis Violaris says what makes the harbor unique to the entire eastern Mediterranean is its state of preservation, combined with its proximity to the coastline.
He says those attributes could bring more people amid a global surge of interest in diving tourism. The fact that Cyprus has earned top marks for the cleanest waters among all other European Union nations for the second year running is also a big bonus.
"Tourists as well as local visitors will have the opportunity to see this impressive ancient harbor, to swim over it and to see how it was constructed, with three moles enclosing it," Violaris told the Associated Press.
Specialist diving crews are currently cleaning the harbor of vegetation and will mark underwater routes that swimmers can follow on their tour.
Diving tourism isn't entirely new for the island. Divers have for years been flocking to the wreck of the MS Zenobia, a Swedish-built ferry that sank in about 140 feet of water just over a mile off the coastal town of Larnaca in 1980.
The wreck has been ranked as one of the world's best for divers. But diving shop owner Michalis Sinopouris says authorities need to do a lot more to put Cyprus solidly on the global diving map like scuttling larger ships near the coasts to create artificial reefs.