South Australian police say they have found dozens of cannabis plants growing in a “secret underground room” through a hidden doorway, behind a bookshelf, on a property north-east of Adelaide.

Key points:

  • SA Police searched properties at Greenwith and Port Wakefield
  • One allegedly featured a “hidden” doorway, concealing cannabis plants
  • Another 99 plants were found growing in a hydroponic operation on the second property

Police said the discovery was made as officers searched separate properties at Greenwith and Port Wakefield on Sunday, as part of an investigation into the “the activities of a group involved in the trafficking and cultivation of cannabis”.

They allegedly found a “hidden” doorway, which could only be opened electronically, behind a bookshelf inside the Greenwith property in Adelaide’s north-east.

Police said about 65 cannabis plants were found behind the doorway, in what appeared to be a “nursery-style set-up”.

Another 99 cannabis plants were allegedly found in five separate grow rooms at the Port Wakefield property.

“The level of sophistication with respect to the secret underground room at the Greenwith property and the manner in which the grow rooms were set up at the Port Wakefield property highlights the extent to which individuals and groups will go to in an effort to avoid detection,” Detective Chief Inspector Darren Fielke said.

“Those members of the community who engage in this criminal activity do so at their own risk and need to be aware that police are continually conducting investigations and operations to target this activity.”

Police said 99 cannabis plants were found at Port Wakefield.(Supplied: SA Police)

Police said $135,000 cash was also found hidden within the Greenwith premises, and that electricity had been diverted at the property.

They said a number of racks, apparently previously used for drying harvested cannabis, were also seized.

A 38-year-old man and a 33-year-old woman, both from Greenwith, have been arrested.

They were charged with multiple drug offences, including cultivating a large commercial quantity of cannabis, as well as diverting electricity.

Both were granted bail to appear in the Elizabeth Magistrates Court in March.