Heracleion was an ancient Egyptian city situated near Alexandria, known for its immense popularity and significance as a port city rich in wealth and trade. Approximately 1,200 years ago, Heracleion abruptly submerged into the Mediterranean Sea. The cause was likely due to the ground beneath it collapsing, causing buildings, streets, and temples to collapse into the water. Today, archaeologists continue to explore the ruins of Heracleion to uncover more about its history and its importance in ancient Egypt.