Detectives unexpectedly found 30 illegal plants in a disused ward in Whitchurch Hospital in Cardiff while searching for a missing person.
It's believed the dealer or gang responsible had also hooked up powerful ultraviolet lights and ventilators powered by the hospital's electricity supply.
"South Wales Police can confirm a cannabis factory of around 30 plants was discovered within the grounds of Whitchurch Hospital in Cardiff," a police spokesman said.
The hidden factory was discovered when police were searching for a missing person on June 30.
Officers entered a former ward in the hospital's main building - which had been boarded up and isolated for decades - before finding the cannabis.
While hospital security guards make regular patrols, it is believed they do not enter any of the boarded up buildings on the site.
Cardiff and Vale University Health Board, which runs the hospital site, said it was doing all it could to help the police with their investigation.
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