They seized 7kg of heroin
Three men where brought to Dublin Garda Stations in relation to the drugs seizure.
They are thought to be in their 40's and 50's.
Around 7kg of the drug was found after an international operation involving agencies in Ireland and the UK.
They're being detained as part of an operation by the Garda's Drugs and Organised Crime Bureau and the UK's National Crime Agency.
Gardaí investigations are ongoing.