Meet the site
The Chasm is the feature that made Piccaninnie Ponds famous. At the end of the shallow First Pond the weed meadow simply ends, and a slot eroded by the freshwater springs drops away into blue – the deepest parts of the spring system are recorded at more than 110 m, and in the region's exceptional visibility you can look straight down the walls far beyond any recreational depth. The upper walls are draped in green algae and aquatic weed; lower down the limestone becomes bare, grey and sculpted, and the light narrows to a band overhead. Descriptions from divers emphasise the sensation of hanging in air above an abyss, and Valerie Taylor famously rated it among the most beautiful sights in Australia.
That same clarity is the danger. There is no visual cue for depth, narcosis creeps up quickly, and in the late 1960s, 1970s and 1980s several divers died here. Those deaths, together with others at the Shaft and Kilsby's, drove the creation of the Cave Divers Association of Australia and the rule that only rated divers dive the Chasm under strict depth limits written into the permit. The operational depth limits were permit conditions and should not be confused with the geological depth.
A dive here is usually a wall dive: drop over the lip, choose one side, descend to your limit, look down, and come back up the other side. Freshwater fish, shrimp and eels are around the weed at the top. The Chasm links the First Pond with the rest of the system and is usually combined in the same permit slot with a look at the Cathedral. It suits CDAA-rated divers with excellent buoyancy and depth discipline – and at present nobody, because the ponds are closed while the ecosystem recovers from an algae outbreak and low spring flow.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Piccaninnie Ponds – The Chasm is recorded as Sinkhole/Cenote in Mount Gambier Sinkholes & Caves. The listed access is shore. Confirm the actual meeting point, route and permission to visit; a map pin does not establish any of these.
Topics flagged by the stored research
These are questions prompted by the existing notes, not a verified or complete hazard assessment.
- Planned depth
- Confirm the intended route and training requirements; the recorded maximum is not a target.
Historical access notes exist for this record, but have not been independently verified for current use. Request current directions from the operator or site manager rather than following an old entry description.
Questions, answered
Is Piccaninnie Ponds – The Chasm suitable for my certification?
The record lists Cave/Cavern certification. That does not establish suitability for every route or day. Share your training, recent experience and equipment needs with the operator and ask about the specific proposed dive.
Can I book Piccaninnie Ponds – The Chasm through YouDive?
YouDive is an independent research directory. Contact an operator directly to confirm whether it currently runs the trip, the inclusions and the booking terms.
What you might see
Aquatic weed and algae on the upper walls, eels, freshwater shrimp, small native fish near the lip
Location
Narrow, spring-eroded sinkhole at the end of the First Pond at Piccaninnie Ponds, dropping from the weed-covered lip to more than 100 m.
Facilities nearby
As for Piccaninnie Ponds: parking, toilets, divers' changing shelter; fills and hire in Mount Gambier.
Before you make plans
Conditions, access and operator schedules can change. This is a location guide, not a dive plan. Ask a local operator about current conditions and suitability for your training and experience.
Sources & further reading
mountgambierpoint.com.auparks.sa.gov.auen.wikivoyage.orgcavedivers.com.auen.wikipedia.orgRecord updated 26 Sept 2026. Source claims are being reviewed.