Dwaraka is an ancient city in India and is believed to have been ruled by Lord Krishna himself. It was a port city on the gulf of Cambay in Gujarat. It is believed to have been submerged and the modern city of Dvaraka is only said to be built later. Archaeologist Graham Hancock goes in search of the submerged city and hypothesizes that the city could have been flooded at the end of the last ice age (around 10000 years ago) and that the people could have moved up and settled along river Saraswathi giving rise to the Indus-Saraswat civilization. These people had the knowledge of urban planning that can be observed from the ruins of the cities belonging to the civilisation. This discovery questions the date of orgin of the Vedas. Did they exist even before 1500 BC (which is widely accepted now) with the civilisation in Dwaraka?? Watch the documentary on YouTube.
Also see.. BBC news article