A previously unknown underground tunnel has been discovered at Crumlin Road Gaol in North Belfast, Belfast Live can reveal.
The tunnel between D wing of the former jail and the Mater Hospital was discovered on Tuesday of this week by workers carrying out construction work at the site, which is now used as a tourist attraction telling the history of the building.
The tunnel, which has been blocked off just feet from the perimeter wall of the former jail, has not been recorded on any maps or drawings of the site.