But recent discoveries give a different picture that fits well with an Indian past that we know from the Epics and Puranas. Well developed techniques of reclamation of land by the construction of a wall in the Arabian sea as early as 8000 years ago have been discovered off the Konkan coast at Srivardhan.
Marine archaeological researches in the Gulf of Cambay had brought to the fore proofs of human settlement as early as 13,000 years BP in the land extensions of west coast of India.
West coast of south India stretching up to Gujarat was very much above the sea level about 6000 years ago. In the region of Gulf of Cambay, a river channel had been identified with indications of human activity about 31,000 years ago. This stretch was seismically active too. A combined effect of sea water rise at the end of Ice age and seismicity forced the people to shift towards Indian mainland gradually.
One notable shift was by Dravideswara Manu (Vaisavatha Manu) along with a host of sages who entered through Dwaraka ( where river Saraswati entered the sea at the end of Ice age) and sailed through Saraswati and settled down in the banks.
By the time of Mahabharata, river Saraswati disappeared at most places. If one traces the path of the refugees from Dwaraka whom Arjuna led forward and arranged their settlements, one would end up in the Indus civilisation settlements.