Researchers in Istanbul have confirmed recently the existence of an underwater copper mine near Heybeliada (Greek: Χάλκη, Latinized: Halki) island, providing rare archaeological evidence for a description recorded by Aristotle more than 2,300 years ago. A submerged mining zone in Camlimani Bay aligns closely with the site that the ancient Greek philosopher detailed in his work “De Mirabilibus Auscultationibus” (On Marvelous Things Heard).
Aristotle wrote that Greek divers collected copper from a mine lying under two fathoms of water, about 3.6 meters (12 feet) below the surface. He said the metal was supplied to major artistic and religious centers in ancient Greece, including the Temple of Apollo at Sicyon (Greek: Σικυών) and monuments at Pheneus associated with Heracles.
His account was unusual because it described a submerged mining operation and claimed that the copper was believed to sharpen the eyesight of those who worked with it.
The island itself was known in antiquity as Halki, Halkitis (Greek Χαλκίτις), and Demonesos (Δημόνησος), with the first two names deriving from halkos (Greek χαλκός), meaning copper, a connection that reflects the distinctive material for which the area was renowned.
Discovery supports centuries-old Greek textual tradition
For generations, scholars debated whether Aristotle’s description reflected first-hand observation or a story shaped by Greek folklore. The question shifted in 2018 when archaeologist Associate Professor Ahmet Bilir of Duzce University conducted a 15-day underwater survey in Camlimani Bay.
His team found copper oxidation on the seabed, ore samples, and extraction traces consistent with organized mining. Dating placed the activity in the Late Classical Period—precisely the era in which Aristotle lived and wrote.
Aristotle's precious ‘Diver’s Copper’ mine has been discovered off Istanbul coast#Aristotle #diverscopper pic.twitter.com/WdN9bOTqt9
— Tom Marvolo Riddle (@tom_riddle2025) November 21, 2025
Diver’s copper in the Greek world
Ancient Greek sources referred to the metal extracted from this site as “halkon kolymbeten,” meaning “diver’s copper.” It commanded higher prices than copper from land-based mines and circulated in limited quantities within Greek trade networks. Bilir describes it as a specialty material reserved for high-status artistic workshops and sacred dedications.
In Greek religious thought, the worth of an offering was tied not only to its material value but to the difficulty of obtaining it. Copper taken from the sea carried symbolic weight because it required skill, courage, and repeated dives.
Greek divers worked several meters below the surface with simple breathing devices mentioned by Aristotle, relying on breath control and endurance. That effort made the metal especially suitable for temple gifts and other sacred works.
Possible link to Lysippos and Greek artistic innovation
Historical evidence shows that copper from Halki reached Sicyon, one of the most important artistic centers in ancient Greece. The city’s sculpture school trained major Greek artists, including Lysippos, the official sculptor of Alexander the Great.
Lysippos reshaped Greek visual culture with his naturalistic proportions and dynamic poses, and ancient writers recorded that Alexander allowed only him to cast his bronze likeness.
If diver’s copper entered the Sicyon workshops, it may have contributed to the production of statues that defined the Greek artistic identity of the Hellenistic period. Researchers say the connection underscores the cultural importance of the copper mined near Halki.
A distinct resource in a Greek-connected economic network
Researchers note that the underwater mine likely played a significant role in the local economy, although it operated independently of typical mining activities in the region. Its limited output and high value kept it in a category recognized across Greek markets.
Aristotle’s mention of miners gaining sharper eyesight may reflect Greek medical practice. Greek and later Roman physicians used copper sulfate and related compounds in eye treatments, a detail that may have influenced the philosopher’s observation.
A rare confirmation of Greek literary testimony
Experts say the discovery is one of the clearest examples of archaeology confirming a specific detail recorded in ancient Greek literature. The match between Aristotle’s description and the physical evidence beneath Camlimani Bay demonstrates the accuracy of Greek textual traditions and highlights the technological sophistication of the classical Greek world.
The discovery closes a gap of more than two millennia, linking a Greek philosopher’s account to modern underwater findings and offering new insight into the trade, art, and religious practices of ancient Greece.
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