Three men have been jailed for turning an underground nuclear bunker designed for Army VIPs into the "largest cannabis factory to be found in the south of England".
Martin Fillery, Plamen Nguyen and Ross Winter admitted to conspiracy to produce class B drugs and abstracting electricity.
Prosecutor Charles Thomas said the farm at the Regional General Headquarters Chilmark, Wiltshire, was capable of producing STG2 million ($A3.3 million) worth of cannabis each year.
The nuclear bunker was decommissioned in in 1990s, but originally was for important military personnel in the event of a nuclear war.
Fillery was jailed for a total of eight years while Winter and Nguyen were each given five years in prison.
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Thomas said Fillery, who had previously written a screenplay about cannabis production, leased the remote building in 2013 and initially used it as a storage facility for his business of selling film and TV memorabilia including model Daleks and cars.
Police were tipped off by a delivery driver who reported a cannabis smell.
When police raided the bunker in February 2017 they found 4425 plants at all stages of production as well as 6500 dead used plants with a total value of STG1.25 million.
About 20kg of harvested and dried cannabis was also found with a value of about STG99,000.
As well as the equipment used to grow the cannabis, which would have cost STG140,000 to set up, the police found living accommodation including a fully stocked kitchen for four Vietnamese men who were employed as gardeners.
Police had initially considered whether modern slavery offences had been committed but they could not prove that the gardeners were being held against their will.
