Tamil Sangam texts recount lost cities like Thenmadurai, submerged around 9600 BC, which align with carbon-dating of the 2nd of 3 great global floods. Tamil maritime hubs traded mainly with Southeast Asia, but also west. The Mahabharata’s drowned city, Dvarka, found in 2012 was also active before the 2nd flood event, finally drowned in the final flood about 5600 BC. Nineteenth century western narratives dismissed these as myths. Sonar evidence, Vedic literature and Tamil epics confirm India’s ancient urban and maritime supremacy, a legacy of global influence long ignored by prejudiced scholars.