For centuries, ships carrying merchants, soldiers and explorers passed through the narrow waters linking the Atlantic Ocean to the Mediterranean Sea. Many never made it out. Now, archaeologists working in southern Spain have uncovered what may be one of the largest underwater archaeological concentrations in the western Mediterranean: a vast ship graveyard hidden beneath the waters of the Bay of Gibraltar. During a three-year investigation known as Project Herakles, researchers documented more than 150 underwater archaeological sites, most of them shipwrecks dating from ancient civilisations to the modern era. Some of the wrecks are believed to be more than 2,400 years old, buried beneath layers of sand on the seabed.
A massive maritime graveyard beneath Gibraltar waters
The discoveries were made in the Bay of Gibraltar, also known as the Bay of Algeciras, a strategically important body of water at the northern edge of the Strait of Gibraltar. The region has served as one of the world’s busiest maritime corridors for thousands of years, connecting Europe, Africa and the wider Mediterranean world.But the same waters that made the bay valuable for trade and military operations also made it dangerous. Strong currents, sudden storms, rocky coastlines and centuries of naval warfare caused countless ships to sink in the area. Archaeologists say the seabed now preserves layers of maritime history stretching across multiple civilisations and historical periods.The discoveries came through Project Herakles, a major underwater archaeology initiative led by researchers from the University of Cádiz and the University of Granada. Before the project began in 2019, only four underwater archaeological sites had officially been documented in the region.Over the next three years, researchers used sonar mapping, marine geophysics, underwater photogrammetry and diver surveys to identify more than 150 archaeological sites hidden beneath the bay. The team also relied on historical naval records and interviews with local fishermen and divers familiar with the waters.According to archaeologist Felipe Cerezo Andreo from the University of Cádiz, the discoveries dramatically transformed understanding of the region’s underwater heritage.
Ancient Roman, Phoenician and war-era wrecks found beneath the sand
The shipwrecks span multiple eras of Mediterranean history. Researchers identified ancient Phoenician and Punic vessels, Roman-era ships, medieval wrecks and military vessels dating to the 18th, 19th and 20th centuries.Many of the oldest wrecks remain partially buried beneath layers of sand, which helped preserve parts of their structure for centuries. Some discoveries date back to the fifth century BC, making them among the oldest underwater archaeological remains documented in the region.One of the most significant finds was the remains of the Puente Mayorga IV, a late-18th-century Spanish gunboat reportedly used in attacks against British ships during periods of conflict around Gibraltar.
The significance of the discovery
Researchers say the wrecks offer a rare opportunity to study thousands of years of maritime activity in one concentrated location. The Bay of Gibraltar has long been shaped by trade, migration, warfare and empire-building involving the Phoenicians, Romans, Moors, Spanish and British.The newly documented wrecks may help historians better understand ancient trade routes, shipbuilding methods, naval warfare and how Mediterranean societies interacted across centuries. Some wrecks may also preserve cargo, weapons and everyday objects lost during voyages long ago.Scientists believe the discoveries could reshape understanding of how important the Gibraltar corridor was to ancient and medieval maritime networks.
Digital technology is helping preserve the underwater sites
To help protect the fragile remains, researchers created digital reconstructions, virtual models and 360-degree videos of several wrecks. These tools allow the public to explore the underwater sites virtually without disturbing them.Archaeologists say digital preservation has become increasingly important because many underwater sites face threats from looting, pollution, industrial activity and changing ocean conditions. By documenting the wrecks in detail, researchers hope to preserve their historical value even if the physical remains deteriorate over time.The team has described the shipwrecks as “museums beneath the sea,” arguing that protecting them means preserving pages of human history hidden beneath the water for centuries.