Two prisoners have reportedly tried to tunnel their way out of Cloverhill Prison, Shawshank Redemption style.
It's believed the inmates covered up their activity by hanging posters over their planned escape route.
It's understood they were rumbled when prison officers tore them down and saw concrete being gouged out around the cell's window frame.
According to The Sunday World which broke the story, lists and plans were uncovered during a search of their cell.
It included routes by which the prisoners could skip the country with a list of contacts and safe houses.
A high-level investigation is now underway.