Gardaí say the cannabis factory discovered on the northside of Cork City last night is one of the biggest of its kind ever uncovered in Ireland.
They estimate it cost up to €500,000 to set up the factory, located in a warehouse on the Hollyhill Industrial Estate.
Some 1,200 cannabis plants were seized. Gardaí believe they may have had a street value of €360,000.
Investigating gardaí say the set-up was very sophisticated and included heavy duty lighting on tracks and fans, used as part of the hydroponic cultivation of the plants.
Superintendent Con Cadogan, who is heading up the investigation, said the plants were being grown in four stages.
A team of forensic investigators from Dublin have arrived at the warehouse where a meticulous examination of the building was being carried out this afternoon.
Meanwhile, gardaí continue to question a man in his early 20s arrested prior to last night’s discovery.