There's concerns a dangerous practice involving thrill seekers and adventure enthusiasts is putting helicopters at risk in the Buderoo National Park.
A high-tension slacklining rope was left suspended 30-metres up across Gerringong Falls at the end of July, causing a potential hazard for helicopter rescues.
Slacklining involves walking or balancing along a suspended length of flat webbing that is tensioned between two anchors.
National Parks and Wildlife Service says it's not the first time slacklining equipment has been left in national parks and if there had been a search and rescue in that particular area, the tightly strung rope would have been extremely difficult for pilots to see and the end result could have been disastrous.
Photo source: https://en.wikipedia.org/wiki/Slacklining