The 80 kilograms (176 pounds) of cocaine were found stashed in the frame of a freight container at the port of Piraeus, the Finance Ministry's fraud agency said.
Authorities in Greece, Croatia, Bosnia and Macedonia had been tracking the shipment for weeks, the agency said, estimating the drugs were worth some €3.6 million (US$5.3 million).
One suspect was arrested in Greece, while six others were arrested in Bosnia and Croatia.
The ship had originally been bound for Rijeka, Croatia, was but was diverted to Greece, police said.
Not that long ago, American soldiers would train their skills to counter insurgent and partisan military organizations. These days, they are trained to show resistance to the regular army of a potential adversary