The Meadowbank Sports Arena outside Magherafelt in Co Derry is the largest indoor facility of its kind in Europe. Last year it was also used as a Count Centre for European and Westminster elections.
These days it is churning out up to two million face masks every week. They are used north and south of the border, on the neighbouring island and beyond.
Over 300 people are working there. With shift work and the use of specialised equipment, production could if necessary be upped to an incredible six million masks per week.
How the sports centre became a busy factory is another extraordinary story. It's a very vivid example of the instant business match-making that can sometimes take place on social media.