A gentle current flows through shallow channels connecting three basin-shaped freshwater ponds approximately 10 metres deep. The clarity of the water enables plants to grow to a depth of about six metres, which is a rare feat for some of these species.
Permits are required to enter the spectacular underwater world of the nearby Piccaninnie Ponds in order to protect the unique and fragile environment.
The site is recognised as a wetland of international importance, yet it looks little more than a shallow, reedy wetland from above ground.
Once you snorkel across the top of 100-metre-deep Chasm or dive into the majestic underwater Cathedral with its steep limestone walls, everything becomes crystal clear, but other local sites will forever remain a mystery, as they are reserved for only the most experienced divers.
Situated in the middle of a paddock on a private sheep property, with access to the site only possible through a limited number of licenses provided by the landowners.
Divers rate the 65-metre-deep sinkhole among the world’s best due to its exceptional water clarity.
A constant trickle of international cave divers travel from the other side of the world to explore gigantic sinkholes like Kilsby’s Sinkhole located on a farming property 15 kilometres south-west of Mount Gambier.
When the sun is directly overhead, it sends down a beam of light which illuminates the crystalline chamber, and divers immersed within the bell-shaped chasm look as though they’re floating on air. The cavity was formed when the roof of an underground chamber collapsed possibly thousands of years ago, and a tooth found on an underwater ledge hints at its age – it’s believed to be from a Thylacoleo marsupial lion which has been extinct for more than 46,000 years!
Another sink-hole is known as ‘Hells Hole’ in the pine forest in the Lower Glenelg National Park.
It is enormous 30 metre deep sink-hole filled with fresh water.