Officers from Revenue's Customs division have seized heroin worth almost €1.54m at Rosslare Europort.
A sniffer dog detected drugs in a vehicle which had disembarked from a ferry arriving from France.
A Mercedes jeep was scanned by the customs x-ray scanner, which indicated an anomaly.
10.26kg of heroin was found concealed in the vehicle.
A Dutch national in his 60s has been arrested and taken to Wexford Garda Station shortly.