A large portion of beach at Inskip Point has collapsed into the ocean on Monday morning, almost three years after a giant hole swallowed caravans and threatened campers in 2015.

Double Island Point Fishing Charters posted on Facebook estimating the hole was 7.5 metres deep.

In mid-September 2015, 200 metres of the Inskip Point coastline fell into the ocean, consuming a car, caravan, tents and a trailer.

The erosion of part of Inskip Point as seen from the air. ( Supplied: Rainbow Beach Helicopters )

Geotechnical engineer Allison Golsby told ABC at the time that there were fears Inskip Point might eventually disappear.

She said the camping site should have had a monitoring system to warn of any further disasters.

Another landslip tore a bite from the coastline a few month later in March, 2016.

Glen Cruickshank from Rainbow Beach Helicopters said this was larger than the one that made international headlines three years ago.

"I'd have to say this is slightly bigger," he said.

A composite photo showing before and after a large section of beach at Inskip Point washed into the ocean. ( Supplied: Google Earth/Rainbow Beach Helicopters )

"This new hole — it's through the beach, it's through the trees, it's a round hole, quite deep and quite big."

He said it was a few hundred metres from where the previous two appeared.

"With all the three sinkholes that have been there, they have all been in an area that's only 400 metres between them.

'It will almost certainly happen again'

University of the Sunshine Coast associate lecturer in Earth Sciences, Peter Davies, said Monday's incident was not considered a sinkhole — which are caused by rock dissolving beneath the ground.

Instead, the phenomenon is known as a near-shore landslide, according to Mr Davies who said it is caused by the fast-moving current alongside Inskip Point eating through the sand beneath the surface which occasionally collapses.

"It will basically collapse because of this undermining of the material by the current going in and out," he said.

"It will repair itself, but it will almost certainly happen again."

Swimming where the beach fell into the ocean at Inskip Point. ( ABC News: Bruce Atkinson )

Mr Davies said while he is sure the landslide will happen again, he can't say when.

"We could see another one in 12 months, or we could see one in a few years," he said.

"All we can say with any certainty is that it's an inherent unstable area and will do this periodically."

'No campsites affected, nobody injured'

In a statement, the Department of Environment and Science said Queensland Parks and Wildlife Service rangers were monitoring the erosion.

"At this stage, no members of the public have been injured or have had property affected by the event," the statement said.

"Local rangers ask that visitors to Inskip Peninsula recreation area take note of current park alerts and stay clear of this section of beach."

Mitch Simpson said the incident had not dampened school holidays for him.

"It's pretty massive, and how did it happen so quickly in such a short amount of time," he said.

"It's made the beach better than yesterday, it's a lot deeper now. It's made the holiday better."

Mitchell Simpson (front left) and Sienna Smith (front middle) said the erosion hasn't dampened their trip. ( ABC News: Bruce Atkinson )

Sienna Smith said it created another activity for them.

"We have goggles so if you swim out you can see green trees underwater from the landslide," she said.

Tourist Matthew Deehan said he was shocked when he saw the landslide this morning.

"We were gobsmacked when we saw it, it's crazy to believe there was a bank here yesterday and today it's disappeared, but it's still a beautiful place," he said.