The Dwaraka Excavations: What Marine Archaeology and Sediment Core Data Reveal About the Submerged Structural Remains

The classical Sanskrit texts of the Mahabharata and the Harivamsa record a dramatic end for the island-city of Dwaraka, the capital of Krishna’s Vrishni clan. According to the Mausala Parva of the Mahabharata, as soon as Krishna departed the earth, the ocean rose and swallowed the city, leaving only the tops of the temples above the water. For generations, this account was treated purely as a mytho-historical literary tradition.

However, since the early 1980s, marine archaeologists have sought to investigate whether a physical reality underlies this coastal cataclysm. Pioneering underwater explorations off the coast of the modern town of Dwarka in Gujarat, led by the late S.R. Rao of the National Institute of Oceanography (NIO), exposed numerous submerged stone structures. While these discoveries have bridged the gap between epic literature and material culture, they have also sparked intense scholarly debate regarding chronology, structural typology, and paleoceanographic changes along the Saurashtra coast.

The Marine Archaeology Record: From Bastions to Anchors

Offshore excavations conducted by the NIO between water depths of 1.5 and 12 meters revealed scattered remains of a submerged port. The underwater site, situated near the mouth of the Gomti river, yielded dressed stone blocks, semicircular and rectangular structures, possible fortification walls, and circular bastions.

Among the most significant discoveries are more than 120 stone anchors of various styles—principally triangular, three-holed stone blocks and prismatic grapnel-type anchors. These anchors indicate that the submerged site was once an active, thriving harbor that hosted merchant vessels from distant shores.

Onshore excavations at the nearby island of Bet Dwarka—often identified as the residential counterpart of the mainland capital—yielded a long cultural sequence beginning in the Late Harappan period (around 1800–1500 BCE). Artifacts from Bet Dwarka include copper rings, a large bronze-age copper fishhook, incised potsherds, and fragments of Roman amphorae (flanged jars) from the early centuries of the Common Era.

Sediment Cores and Sea-Level Models

To understand how these structures came to be submerged, researchers analyze paleoceanographic data and sediment cores from the Arabian Sea. The Holocene sea-level curve of the western coast of India indicates a series of marine transgressions (sea-level rises) and regressions (sea-level drops) over the last 6,000 years.

During the mid-Holocene (around 6,000 to 4,000 years ago), regional sea levels along the Saurashtra-Kutch margin fluctuated, leaving wider expanses of the coastal shelf exposed for habitation. Geologists note that the Saurashtra peninsula is tectonically active, subject to localized subsidence and uplift.

Sediment core analysis reveals a major episode of sea-level rise along this coast around 3,500 years ago, which corresponds broadly with the late-second millennium BCE. Some marine geologists suggest that the rapid inundation of ancient coastal settlements may have been accelerated by high-energy seismic activity, such as a localized tsunami, which caused sudden structural failure and subsequent marine transgression.

⚖ Scholarly Debate: The Chronological Disconnect

While the physical presence of submerged structures off the Dwarka coast is verified, the core of the academic controversy lies in dating these remains.

Dr. S.R. Rao and his supporters argued that the submerged structural ruins and the associated Late Harappan pottery dated to roughly 1500–1600 BCE, matching the traditional dates assigned by some scholars to the Mahabharata events. He interpreted the heavy stone walls and gateways as the defenses of the epic city.

However, several independent archaeologists and researchers have challenged this early chronology. Critics argue that many of the underwater structures are composed of limestone blocks that have not been securely dated to the second millennium BCE.

Archaeologist A.S. Gaur and others have pointed out structural inconsistencies:

• Circular Bastions: The submerged structures off mainland Dwarka feature circular bastions. Rectangular or square bastions are typical of the Harappan and Late Harappan periods, while circular bastions did not become common architectural features in India until the medieval period.
• Epigraphic and Typological Clues: The recovery of a stone block featuring a late-medieval script and the style of the three-holed triangular stone anchors suggest that much of the underwater harbor debris may belong to the early historical or late-medieval periods (roughly 2nd century BCE to 12th century CE) rather than the Bronze Age.
• Methodological Critiques: Historians such as L.B. Kenny warned against correlating archaeological finds with epics purely on emotional grounds, emphasizing that without absolute dating of the underwater mortar and stone, the precise age of the structures remains unproven.

Modern Surveys and Future Outlook

The investigation into Dwarka’s submerged remains has been revived with modern technology. The Underwater Archaeology Wing of the Archaeological Survey of India (ASI) has deployed high-resolution side-scan sonar, multibeam bathymetric mapping, and 3D photogrammetry to map the seabed anomalies without disturbing the structures.

Diver-archaeologists are currently using optically stimulated luminescence (OSL) dating—which measures the last time quartz sediment was exposed to sunlight—alongside sediment coring to establish an absolute chronology for the construction of the stone jetty and walls.

The physical evidence reveals that a highly active ancient port city existed at the mouth of the Gomti river, experiencing multiple phases of destruction, rebuilding, and marine inundation over thousands of years. Whether these stones represent the actual legendary city of the Harivamsa, or a succession of historical trading ports whose final submergence reinforced a preexisting epic tradition, remains a subject of ongoing scientific inquiry. Note that information regarding archaeological timelines and technology may be updated as the current ASI excavations progress.