Someone recently asked why sea voyages were prohibited in India. The answer is simple: sea voyages were not prohibited in India. How else do you explain the Indian Ocean Trading system where merchants — Gujarati vaniyas, Tamil and Telugu chettis, Malabar Mappilas, Saraswats, Navayats — traded in ports from Meleka to Aden? The June 2009 issue of Pragati had an article by Manmadhan Ullatil on this trading network.
But the history of sea voyages is much older; around 2000 B.C.E, there was a Meluhhan (identified as people from Indus region) colony in Mesopotamia. There was also a person who could read Meluhhan and Sumerian or Akkadian which could help in deciphering the Indus script. Read all about it in the latest issue of Pragati. The references can be found here.