Located in Gujarat, Dholavira was the largest port-town of the Harappan civilization that flourished for about 1,500 years. Researchers have been perplexed about why the civilization came to an abrupt end. Archaeological excavations indicate that the township comprised of the castle, the middle town and the lower town.

Dholavira is the oldest known site in the world which could have been hit by the tsunami, experts at the NIO said. As per their latest findings, there is indication of marine sediments possibly transported to the site by an extreme oceanic incident, which they attribute to the tsunami.

A team of palaeo-climatologists, marine archaeologists and geophysicists from NIO surveyed an unexcavated area of the lower town using ground penetrating radar (GPR).