A second man has been remanded in custody at the Special Criminal Court in Dublin on bomb making charges.
Conan Murphy, 23, from Plaster in the Mount Pleasant area of Dundalk was charged with unlawful possession of explosives on Tuesday evening.
The charges relate to the discovery of an alleged dissident bomb-making factory near Dundalk on Saturday.
56-year-old Philip McKevitt from Aghaboy, Mount Pleasant, also appeared in court on Tuesday.
He is charged with possession of a modified trailer and two gas cylinders.
Mr McKevitt, who appeared in court with a bandage on his head, stood briefly as the charge was read out but did not speak.
His lawyer told the court Mr McKevitt had suffered injuries to his head and body and needed medical attention.
He was remanded in custody until 8 June.
The men were arrested after armed Garda officers raided a house and outbuildings on the Old Newry Road in Dundalk on Saturday.