1,400 kg of heroin was seized by the Indian Coast Guard, is among the largest drug busts in recent Indian history.
$ 545 million value consignment was found aboard a merchant ship off the coast of the western state of Gujarat.
The ship was coming from Iran and was intercepted after a three-day long operation.
Intelligence Bureau and the Indian Navy are investigating the case. No arrests have been made at present.
India has strict narcotics laws, with a minimum punishment of 10 years imprisonment for heroin smuggling offenses.