Men Swept Off Rocks At Notorious 'Figure Eight' Pool, Police Search Ocean For Missing Friend

A man is missing and another is injured after the pair were swept off rocks at the famous but dangerous Figure Eight Pools in the Royal National Park south of Sydney.

A man in his 20s was able to climb to safety on a rock shelf and was treated for minor lacerations at the scene about 2pm on Monday, authorities say.

But a search is underway for the other man, believed to be 22, who disappeared under the water and did not resurface.

NSW Police say three other people who were with the pair on the rocks at the time weren't injured.

The Figure Eight pools are a popular spot to snap an Instagram pic, but they're also notoriously dangerous.

READ MORE: The Instagram Spot So Dangerous, It Needs An Online Warning System

Officers from Wollongong Police District, assisted by the Marine Area Command, Surf Life Saving, NSW Ambulance, and Westpac Lifesaver Helicopter commenced a search of the area.

The search is expected to continue until later this evening.

The Westpac Life Saver Rescue Helicopter (AAP Image/Joel Carrett)

"Police remind those planning to visit the Royal National Park to check weather conditions and tide times before heading out," NSW Police said in a statement.

It is just the latest serious safety incident at the Instagram hotspot, which has become hugely famous online for its near-perfect round swimming holes.

More than 100 people were injured, three seriously, when a large wave crashed over the rock shelf in 2016. A year later, a 22-year-old tourist was rushed to hospital in a critical condition after suffering a fall.

An online warning system was launched in December, alerting would-be visitors to the dangerous weather conditions at any given time.

The tool had rated the entire day of Monday as an 'extreme risk', warning that waves could wash over the whole rock shelf and the nearby walking track, and telling people "do not visit".

The pools, in the Royal National Park

"If you’re in the rock pools you’ll be trapped and thrown against the rocks, before being washed out of the pools and dragged across the rock shelf," the 'extreme' warning states.

"If you’re standing on the rock shelf you’ll be knocked over by waves and dragged across it. You could also be washed into the ocean. You’ll risk severe injuries, including broken bones and head injuries."

More to come.

With AAP.