Where was the cannabis farm discovered under the M1 motorway?

The cannabis farm was found in a boarded-up drainage culvert running beneath the M1 motorway carriageways near Watford.

Who found the cannabis grow beneath the M1?

Road maintenance workers discovered the sophisticated cannabis grow while working on the motorway.

What efforts were made to dismantle the M1 cannabis factory?

Dismantling the factory was difficult due to heavy rain and its remote location, with a local landowner providing transport.

Home / Crime and Justice / Hidden Cannabis Farm Found Under M1 Motorway

Hidden Cannabis Farm Found Under M1 Motorway

11 Dec

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Summary

Cannabis factory discovered in a culvert beneath the M1 motorway.
Sophisticated setup featured shelving to keep plants above water.
No arrests have been made; police seek public information.

Hidden Cannabis Farm Found Under M1 Motorway

Road maintenance workers stumbled upon an elaborate cannabis farm concealed within a drainage culvert directly beneath the M1 motorway. The discovery was made on November 28, 2025, near the village of Watford, revealing a sophisticated operation hidden from view. Access to the tunnel had been carefully disguised, making the find highly unusual.

The police described the setup as highly advanced, noting extensive shelving designed to keep the cannabis plants elevated above any potential water. Diversion of power for lighting and cultivation equipment highlighted the criminal enterprise's complexity. Dismantling the factory proved challenging due to torrential rainfall and the remote location, requiring assistance from a local landowner for transport.

Investigations are ongoing, with police confirming that no arrests have been made in connection with the discovery. Authorities are urging anyone with relevant information regarding the sophisticated cannabis grow to come forward and assist their inquiry.