Seven male immigrants were discovered in a trailer at Rosslare Europort in Co Wexford this morning.
Gardaí said they are investigating possible immigration offences in connection with the discovery.
The six men and one male juvenile received medical attention at Wexford Garda Station and were all deemed to be safe and well.
They were found at around 5.55am after a truck arrived at the port.
The trailer has been detained by gardaí for a technical examination.
The six men were refused leave to land and are now expected to leave the jurisdiction tonight on a return ferry to the country they arrived from.
The juvenile is currently in the care of Tusla's Unaccompanied Minors Unit.
Gardaí said investigations are ongoing alongside the relevant international stakeholders.
Last January, 14 people were found hidden in a refrigerated trailer at the Europort.
Nine men, three women and two young girls were found when the vehicle was stopped and searched after arriving on a ferry.
