The Irish U20s got their World Cup campaign off to a winning start, but it required an unnerving penalty from Tomás Quinlan with the last kick of the game to secure victory.
The substitute out-half claimed a win for Nigel Carolan's side with a stunning kick from the right-hand touchline to deprive Argentina of a win in parma, Italy.
The Pumitas looked set for the win when they slotted over a 77th-minute penalty of their own before referee Lloyd Linton gave Ireland hope when he pinged Argentina for an infringement at the breakdown.
It was a good day from the tee for Ireland, with Joey Carbery missing only one of his six attempts before Quinlan displayed nerves of steel right at the death.
Ireland, having achieved their best ever finish last year when they were fourth in New Zealand, know that victory is vital today in Parma against Argentina if they are to entertain hopes of a similar run in the renamed World Rugby U-20 Championship.