There Is a City Under the Sea

For centuries, the city of Thonis-Heracleion was little more than a legend, a lost port mentioned in ancient texts. Before the rise of Alexandria, it was Egypt's premier gateway to the Mediterranean world, a bustling hub for international trade and religious worship. Its grand temple to the god Amun-Gereb was a site of major importance where pharaohs came to be legitimized as rulers of the kingdom. The city thrived for hundreds of years, controlling all maritime traffic into the country and collecting taxes on imported goods.

The city’s demise was not a single, catastrophic event, but a slow, inevitable sinking. Thonis-Heracleion was built upon unstable delta sediments at the mouth of the Nile River. Over time, a combination of rising sea levels, seismic activity, and the immense weight of its large temples and buildings caused the water (Review)-logged clay to gradually give way in a process called soil liquefaction. Piece by piece, the metropolis slid beneath the waves, eventually vanishing completely from sight and memory.

Its rediscovery in 2000 in Aboukir Bay revealed a breathtaking underwater world. A thick blanket of sand and silt had acted as a remarkable time capsule, preserving its treasures with stunning clarity. Archaeologists have since mapped out the city, uncovering the colossal statues of gods and pharaohs that once stood at its temple entrances. They also found an entire fleet of ancient ships, gold coins, intricate jewelry, and inscribed stone slabs that have rewritten our understanding of this vital ancient port.