Gardaí released a statement as the cargo vessel was to be brought into Marino Point in Cork harbour.
A garda spokeswoman said: “After Army Ranger Wing personnel secured the vessel, members of the Irish Navy, the Garda National Drugs & Organised Crime Bureau (GNDOCB) and Revenue’s Customs Service were transferred to the cargo vessel, which is currently under escort by Naval Ship to an Irish port.
The cargo vessel will now be the subject of a detailed examination by Revenue Customs and An Garda Síochána.”