Greek shipping minister Miltiades Varvitsiotis told reporters two tons of heroin were brought into the country on the Togo-flagged 910-dwt Noor One (built 1963).
He said the concealment of the drugs was so well-planned that its detection was not easy even with trained dogs.
"Some who believe that Greece is a free-for-all will be disappointed", he added.
"The country has reliable security authorities and a harbour corps that wages a battle at all levels on a daily basis and all deserve warm congratulations."
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