After the garda (Irish police) in Dublin seized cocaine with an estimated street value of €2.8m (£2.5m), eight people were detained.
When officers searched a commercial building on the Long Mile Road on Tuesday, they made the discovery.
A hydraulic drug press, equipment for mixing drugs, a money counter, and €78,000 (£69,000) in cash were also discovered.
It was a cocaine-mixing factory run by the Kinahan crime gang, according to Irish broadcaster RTÉ.
18 people have died as a result of the Kinahan gang's protracted feud with a rival crime gang.
During the searches, a hydraulic drug press was found.
Two vehicles were stopped during the planned operation Tuesday morning just after 11:00 local time in the Irish capital's Ballyfermot and Blanchardstown neighborhoods.
During the operation, officers seized over 2,000 nitric oxide and mixing agent canisters.
Ages of the seven men and one woman who have been arrested range from their late 20s to their early 50s.
"The significant seizure of cocaine has shown that An Garda Sochána is determined to disrupt the distribution networks of organized groups who harm our communities," Assistant Commissioner Justin Kelly said.
