A cannabis factory has been found in a bunker beneath a rural Lincolnshire barn.
Pigeon coops and farm buildings helped disguise the sophisticated underground cannabis complex in a village near Sleaford, which officers have been searching throughout the weekend.
Police say cannabis plants were being grown in three rooms in the man-made underground maze with thousands of pounds invested in equipment to produce the class B drug.
Officers swooped on the property and found that the total number of cannabis plants discovered said to be in excess of 400.
The value of the drugs seized could run into tens of thousands of pounds but officers believe it will take until today for them to calculate its true value.
It is understood that attempts were made by the owners to burn some of the cannabis plants as police arrived at the property while Lincolnshire Fire and Rescue was required to pump out water from the partially-flooded underground bunker.
Three men and a woman have been arrested, interviewed and bailed by Lincolnshire Police.
Lincolnshire Police Inspector Simon Heads said: “We are pleased to be able to remove the drugs from the streets of Sleaford and the surrounding area.”