At a glance
Beneath the waters of Abu Qir Bay, just off the coast of Alexandria, lies one of archaeology's most extraordinary discoveries: the sunken city of Thonis-Heracleion. Once Egypt's greatest international port and the mandatory entry point for all ships arriving from the Greek world, the city vanished beneath the Mediterranean around the 8th century AD — taking with it an incomparable trove of statues, coins, ships, and sacred objects.
Since French underwater archaeologist Franck Goddio first located the site in 2000, excavations have yielded thousands of artefacts in astonishing states of preservation. Buried under metres of sediment, many objects survived better than comparable finds on dry land, their colours, inscriptions, and fine details still intact after more than a millennium beneath the waves.
Why the sea floor preserves so well: When Heracleion sank, rapid sediment deposition sealed its contents in an oxygen-poor environment, dramatically slowing corrosion and biological decay — effectively turning the harbour floor into a natural time capsule.
Table of contents
1) The Lost City of Thonis-Heracleion
For centuries, scholars knew of Heracleion only through ancient texts — Herodotus described it, and inscriptions referenced its great temple of Amun-Gereb. Yet no one could locate the city on land. The answer came in the year 2000 when Franck Goddio and the European Institute for Underwater Archaeology (IEASM), in collaboration with Egypt's Supreme Council of Antiquities, finally pinpointed its location about 6.5 kilometres off the present coastline of Abu Qir Bay.
The city had served for centuries as Egypt's principal customs and trading port, the gateway through which all foreign goods — and foreign visitors, including the legendary Helen of Troy according to some ancient accounts — entered the kingdom. Its catastrophic submersion, caused by a combination of earthquakes, tidal waves, and the gradual liquefaction of the clay and sand on which it was built, preserved its contents with remarkable fidelity.
How the City Sank
Geological analysis suggests Heracleion was built on unstable deposits of Nile sediment. Over time, the weight of its massive stone temples and statues caused the ground to liquefy during seismic events, allowing entire districts to slide into the sea. The process likely occurred in stages between the 3rd and 8th centuries AD, explaining why coins and objects from multiple periods have been found at different depths across the site.
2) The Treasures of the Deep
The diversity and quality of objects recovered from Heracleion is staggering. Because they were buried in sediment, they are often in better condition than those found on land. The finds range from monumental sculpture to delicate bronze ritual instruments, from grand architectural fragments to humble everyday pottery — together painting the most complete picture yet of a thriving ancient port city.
The table below summarises the four most significant categories of finds, as documented by the excavation team and displayed in Egyptian and international museums:
| Artifact | Significance |
|---|---|
| Colossal Hapi | Largest known statue of the Nile god, symbolizing abundance. Standing 5.4 metres tall in red granite, it is the centrepiece of the entire Heracleion collection. |
| Gold Coins | Byzantine and Islamic coins proving the city remained active until the 8th century AD, long after the Roman period — overturning earlier assumptions about when the city fell. |
| Ritual Ladles | Bronze ladles used in temple ceremonies, found in pristine condition. Their fine state of preservation has allowed scholars to reconstruct exact ritual practices performed at the temple of Amun-Gereb. |
| Shipwrecks | Over 70 ancient ships found in the harbour, the largest naval collection from antiquity anywhere in the world. The vessels span centuries and include both Egyptian and Greek hull designs. |
A Living Time Capsule
Excavations are ongoing; less than 5% of the known site area has been fully explored. Each dive season brings new discoveries — in recent years these have included lead and bronze anchors, gold jewellery, and fragments of wooden cult boats used in religious processions along the Nile's ancient channels.
3) The Colossal Statue of Hapi
The undisputed centrepiece of the Heracleion finds is the 5.4-metre tall red granite statue of Hapi, the ancient Egyptian god of the Nile inundation. When divers first encountered it resting on the harbour floor, its sheer scale was breathtaking — it is the largest statue of Hapi ever discovered, and one of the largest Egyptian sculptures recovered from an underwater context anywhere in the world.
Key Facts: The Hapi Statue
| Detail | Data |
|---|---|
| Material | Red Aswan granite |
| Height | 5.4 metres |
| Period | Late Period, c. 664–332 BC |
| Current Location | Egyptian Museum, Cairo |
Who Was Hapi?
Hapi was the personification of the annual Nile flood — the lifeblood of Egyptian civilisation. Depicted as a heavyset male figure with pendulous breasts (symbolising fertility and abundance), blue or green skin (representing water), and carrying offerings of lotus flowers and papyrus, Hapi was venerated across Egypt as the source of all agricultural prosperity. A colossal statue of Hapi at the entrance to the main harbour would have served as both a divine guardian and a powerful statement of the city's importance as Egypt's gateway to the world.
Recovery and Conservation
Raising the statue required meticulous planning. Divers worked for weeks to excavate the sediment around the statue's base before an inflatable lifting device was used to bring it gently to the surface without fracturing the ancient stone. Conservation specialists then spent months stabilising the granite, removing marine encrustations, and treating the surface to prevent deterioration upon exposure to air. The statue now resides in the Egyptian Museum in Cairo, where it stands as one of the most dramatic exhibits in the building.
4) Ancient Ships & the Harbour
The harbour of Thonis-Heracleion has yielded the largest collection of ancient ships ever found in a single location. More than 70 vessels have been identified to date, ranging from small river craft used to ferry goods between the city's canals to large ocean-going merchant ships capable of crossing the Mediterranean. Their variety and number offer an unprecedented window into ancient maritime trade and shipbuilding technology.
Several of the ships were found with their cargo still intact — amphorae of wine and olive oil, bronze anchors, lead net-weights, and wooden storage chests. One particularly well-preserved Greek-style vessel contained dozens of ceramic vessels from the Aegean, direct evidence of the lively commercial exchange between Egypt and the Greek world that ancient sources describe. The sheer volume of anchor finds — more than 700 lead and stone anchors have been recovered — underscores the harbour's role as one of antiquity's busiest maritime hubs.
A Record-Breaking Naval Find
The 70+ ships at Heracleion represent the largest ancient naval collection from antiquity. By comparison, the famous Bronze Age shipwrecks at Uluburun (Turkey) and Cape Gelidonya are singular vessels. Heracleion's harbour preserves an entire ancient port ecosystem — not just ships, but the anchors, ropes, wooden planks, and rigging that kept them sailing.
5) Gold Coins & Trade Evidence
Among the most historically significant finds at Heracleion are the gold and silver coins recovered from the harbour floor and from the ruins of the city's warehouses and customs buildings. These small objects carry enormous implications: they prove that Heracleion remained a functioning, commercially active settlement centuries later than previously believed.
Byzantine gold solidi and Islamic gold dinars have been recovered side by side — a remarkable testament to the city's cosmopolitan character in its final centuries. The presence of Islamic coinage in particular pushed the accepted date of the city's final submersion forward significantly, confirming that parts of Heracleion were still inhabited and trading well into the 8th century AD, long after the Arab conquest of Egypt in 641 AD.
What the Coins Tell Us
- Chronological evidence: The presence of 8th-century Islamic dinars proves the city's occupation lasted at least 700 years longer than some earlier scholars had proposed.
- Trade networks: Greek, Phoenician, and later Byzantine coinage shows Heracleion maintained commercial links with the entire Mediterranean world throughout its existence.
- Wealth of the port: The concentration of gold coins in warehouse contexts suggests the city operated a sophisticated customs system, collecting duties on imported and exported goods before they entered the Egyptian interior.
6) Sacred Objects & Temple Ritual
Beyond the monumental statues and commercial artefacts, Heracleion has yielded a remarkable collection of sacred and ritual objects that illuminate the religious life of the city. The great temple of Amun-Gereb — the principal sanctuary of Heracleion, equivalent in status to the Karnak temple in Luxor — has been partially mapped on the sea floor, and from its precincts have come some of the most emotionally resonant finds of the entire excavation.
Among these are the bronze ritual ladles used in temple ceremonies — slender, elegantly formed instruments for pouring libations — found in pristine condition, their surfaces still smooth, their engravings still sharp. Alongside them were faience and bronze statuettes of Osiris, Isis, and Horus, votive offerings left by worshippers over centuries. Dozens of intact oil lamps, still bearing traces of the fuel that once burnt in them, were found arranged in rows as if a ceremony had been interrupted mid-performance by the disaster that swallowed the city.
7) Seeing the Artefacts Today
Where to See the Finds
- Egyptian Museum, Cairo: Houses the colossal Hapi statue and major monumental pieces from Heracleion.
- National Museum of Alexandria: Dedicated Heracleion and underwater archaeology galleries with artefacts, maps, and video footage of dives.
- Louvre, Paris: Selected loans from the collection have been displayed in landmark temporary exhibitions.
Planning Your Visit
- The Egyptian Museum in Cairo is open daily; allow at least half a day for the full collection.
- The National Museum of Alexandria is smaller but more focused on the underwater finds — ideal for those specifically interested in Heracleion.
- Guided tours of Alexandria can combine the museum with a visit to Abu Qir Bay to see the excavation location from the surface.
Suggested Itinerary: The Underwater Heritage Trail
- Day 1 — Cairo: Visit the Egyptian Museum to see the colossal Hapi statue and other monumental Heracleion finds in their newly restored galleries.
- Day 2 — Alexandria: Explore the National Museum of Alexandria's dedicated underwater archaeology rooms, then visit the Bibliotheca Alexandrina for additional exhibits and documentary screenings.
- Day 3 — Abu Qir: Take a guided boat trip to the coordinates of Heracleion in Abu Qir Bay; on clear days, the outlines of ancient structures are sometimes visible from glass-bottomed vessels.
Last updated: April 2025. Entry prices and opening hours are subject to change; verify with local authorities or your tour operator before visiting.
8) Sources & Further Reading
The following are reputable starting points used to compile the information on this page.
- Goddio, Franck & Masson-Berghoff, Aurélia (eds.). Sunken Cities: Egypt's Lost Worlds. Thames & Hudson, 2016. — The definitive illustrated volume accompanying the British Museum's landmark Sunken Cities exhibition; co-written by the lead excavator.
- Goddio, Franck. Thonis-Heracleion in Context. Oxford Centre for Maritime Archaeology, 2015. — A detailed academic study of the city's role in the ancient Mediterranean world, with extensive site maps and artefact catalogues.
- Stanley, Jean-Daniel & Bernasconi, Maria Pia. "Holocene Depositional Patterns, Neotectonics and Subsidence in the Nile Delta." Science, 2006. — Key geological study explaining the processes that caused Heracleion's submersion.
- European Institute for Underwater Archaeology (IEASM). Heracleion Research Bulletins. Published annually, 2001–present. — The primary academic source for ongoing excavation results; available via the IEASM website at ieasm.org.
Hero image and section photographs: Wikimedia Commons (CC BY-SA). Artefact photography courtesy of Christoph Gerigk / Franck Goddio / IEASM where specified in museum credits.