The hole, first spotted by walkers at a popular tourist spot, is the size of half a tennis court and is expected to grow.
People taking a morning walk in the area first spotted the hole, the TripleM radio station reported.
"It's a fair way down and the Southern Ocean is fairly churned with big rollers [waves] coming in there.Holyman said:"There's no warning when these things give way... You don't get a warning. If that area drops it just happens." "Having the ocean and limestone cliffs, we will have erosion and undercuts over time and they collapse every so often.
According to Triple M, the council will work with Flinders University and coastal engineers to study the sinkhole and to understand how to protect the coastline.
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