An estimated £1million of drugs have been seized from a cannabis cave at a farm near Bradford-on-Avon, Wiltshire.
But its full size has yet to be determined as two Albanians were held after police investigations.
Two beds were also found in the tunnels as Wiltshire police wait for the tunnels to be made safe before they can get a clear idea of the size of the drug operation.
The dark tunnels in Bradford-on-Avon, Wiltshire show the £1million of Class B drug bust
Wiltshire Police are waiting for the tunnels to be made safe before investigating further
Police told The Sun: ‘We are not sure how big the factory is because there are significant safety issues.’
Inspector Nick Mawson added: ‘Locals are likely to see police presence as officers gather evidence.
The picturesque village could have the ‘biggest’ drug factory in the UK
Equipment including gas masks and rubber gloves were found in the quarry
One room inside the quarry shows the drug operation which took place in the historical setting
Two beds were found in the tunnels and two Albanian men have since been charged
‘This work is anticipated to carry on into next week due to the size of the location.’
Sources say the farm at Bethel Quarry near Bradford-on-Avon, Wilts, could dwarf the previous biggest, found 26 miles away at the former Chilmark nuclear bunker last year.
Three men were jailed after police officers found 4,425 plants in 20 rooms with the potential to generate a £1.25million-a-year crop at the bunker.
Bradford-on-Avon features as an incredible tourist hot spot for its Romam villas
Huge metal drums in the disused factory forgotten for years after it closed in 2010
The quarry used to tore equipment in World War Two and later became a mushroom farm
Fluorescent lights lead a path throughout the tunnels as bare cables hang dangerously
The limestone quarry made the perfect hiding place to grow the illicit substances
The quarry used to store equipment in World War Two and later became a mushroom farm for Heinz soup, closing in 2010.
The former stone quarry is the perfect place to grow an illicit substance due to the fact its hidden deep below ground.
Tourists now flock to Bradford-on-Avon for its Roman villas.
Its most famous resident was Antiques Roadshow host Hugh Scully, who died aged 72 in 2015.
Alksander Shyti, 45 and Altin Deda, 39, were charged with the production of cannabis at the quarry and were due to appear at Swindon Magistrates Court yesterday but interpreter issues meant it was postponed.