An anonymous tip-off has led to the discovery of a cannabis factory in Nottinghamshire containing 3,000 plants with a street value of £3m.
Officers raided a former chicken factory on Barrows Hill Lane in Jacksdale where they also found electrical equipment worth £250,000.
Police described the factory as a "sophisticated set-up", containing living quarters complete with a gym.
Seven men, aged between 20 and 48, have been arrested.
The men are currently in police custody following the raid on Wednesday afternoon.
'Huge scale'
Ch Insp Mark Wakeland said: "One attending officer who has executed drugs warrants for the past seven years said it was the biggest and most sophisticated set-up he had ever seen.
"Cannabis plants were being grown on an industrial scale across the factory floor - a huge space roughly 50m (164ft) long by 25m (82ft) wide."
He added it was "an immensely professional operation".
Officers acted on information received anonymously via Crimestoppers.
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