Paramedics are currently involved in a rescue operation at the Figure 8 Pools in the Royal National Park in Bundeena.
Emergency services were called around 1:20pm on Wednesday, with reports of one person with abrasions, a foot injury and a possible knee injury, and was unable to walk.
Two other people were reported to have had minor injuries.
A NSW Ambulance spokesman said it could be some time for paramedics to get to the patient, as the walk was more than six kilometres and could take around one-and-a-half hours to reach the patient.
The popular tourist and swimming spot is located on a dangerous rock shelf near Burning Palms Beach, and has been the subject of many incidents and even deaths in the past.
The NSW National Parks website does have a risk-level rating, however for Wednesday it was given a "low" danger score.