Coast guard officers at the port of Igoumenitsa, northeastern Greece, seized 88 kilos of hashish early on Saturday.
The drugs were hidden in airtight 1-kilogram packages in a secret compartment of a van that had German license plates.
Officers searched the vehicle after observing the driver behaving unusually. The hashish was discovered by a sniffer dog and the 35-year-old driver was arrested. Authorities did not make it clear whether he was Greek or a foreign national.