Some 14 people were found hidden in a truck that arrived by ferry at Rosslare Harbour on Sunday afternoon.
Garda Immigration Officers discovered the 12 men and two women during a routine search after the ship from France docked around 2pm.
The people were found inside a refrigerated trailer unit aboard the Irish Ferries Oscar Wilde ferry.
It is understood that apples were being transported in the truck and the temperature of the unit was around 5 degrees.
All members of the group - which includes one youth - are in good health.
However, one man has been taken to Wexford General Hospital as a precaution.
The ferry had set sail from Cherbourg in France on Saturday night but it is believed that the people may have been in the unit for up to three days.
All 14 people - who are understood to be from Iran, Afghanistan and of Kurdish nationality - are currently being assessed by immigration officers.
They will be referred to the refuge application commissioners.
Enquiries are ongoing.