Giving details of the seizure at a press conference held here, NCB officials said it was carried out as part of 'Operation Samudragupt' which targeted maritime trafficking of drugs originating from Afghanistan. This is the third major seizure by NCB of maritime trafficking of drugs through the southern route in the last one and a half years, the agency said. As part of the operation, so far around 3,200 kg of methamphetamine, 500 kg of heroin and 529 kg of hashish has been seized, it said.