The caretakers of Sydney’s UNESCO World Heritage-listed Cockatoo Island are celebrating the organisation’s 20th anniversary.

Marie Palmer, who alongside husband Barry McDonald has volunteered for the Harbour Trust for 15 years, shared with Jim Wilson and his listeners some of the history.

“Cockatoo Island was probably a meeting place for the First Nations people, because several clans come down to the water at that point.

“We are doing further research at the moment in conjunction with the Indigenous communities, and we’ll find out more.”

Post-colonisation, convicts were moved to the island from Norfolk Island in 1839.

“They had to build their own prison.”

Press PLAY below to hear more about the history of Cockatoo Island

Image: Supplied, Getty