South Australia
Diving in Mount Gambier Sinkholes & Caves
The limestone around Mount Gambier is riddled with water-filled sinkholes and caves, and they are the heart of Australian cave diving. Kilsby Sinkhole (65 m, clear as air), the Shaft (124 m), Piccaninnie Ponds' Chasm and Cathedral, Ewens Ponds' spring-fed creek, and the Tank Cave system with more than 8 km of passage. Most sites require Cave Divers Association of Australia rating; Kilsby and Ewens are open to recreational divers by booking.

THE LOCAL PLANNING BRIEF
Understand the options around Mount Gambier Sinkholes & Caves
South Australia’s regional directory includes Adelaide, peninsulas, islands and inland records. Use the access and environment information to distinguish these choices. A jetty, a coastal boat trip and a cave-related listing are different activities with different requirements; they should not share a single generic holiday plan.
A specialist collection, not an open-water shortlist
The words sinkhole and cave should prompt a specific training and access discussion. Do not assume an inland record is publicly accessible or suitable for an ordinary recreational holiday dive. Establish the responsible site manager, current permission process and qualifications required for the exact activity. A directory description, photograph or map cannot authorise access or replace specialist instruction.
One useful question: Who manages the specific site, and what current permissions and training requirements apply to the proposed activity?
What this regional directory records Counts describe published records, not bookable trips or confirmed open sites.
There are 36 published site records in Mount Gambier Sinkholes & Caves. The recorded categories include cave/cavern (18), sinkhole/cenote (16), freshwater lake/river (2). These categories reflect the database; they are not a ranking, a conditions report or an assessment of your suitability.
Use the Mount Gambier Sinkholes & Caves site cards to compare recorded access and depth, then open the individual pages for the map accuracy and source notes. Sites grouped in a region are not necessarily close enough to combine in one day.
Research operators in South Australia →Ask before booking
- Is the proposed activity open water or an overhead environment?
- Who manages access and where can we check current rules?
- Which equipment and transport arrangements must be booked ahead?
Save the answers with the contact name and date. Separate confirmed arrangements from items still waiting for a reply.
Record your trip questions →Questions, answered
How do I choose a dive in Mount Gambier Sinkholes & Caves?
Begin with the individual site and its source notes, then discuss the proposed trip with a local provider. The 36 published records are research options, not a list of trips available today. Match the plan to your training, recent experience and the operator’s current requirements.
When should I visit Mount Gambier Sinkholes & Caves for diving?
Choose dates with a provider who runs the activity you want, then discuss seasonal patterns, recent conditions and alternative itineraries. A generic best-month claim cannot establish the conditions at your exact site or guarantee a wildlife encounter.
Can I use these maps to enter or navigate a dive site?
No. Recorded and approximate map positions support orientation only. Confirm the exact access, permissions, meeting point and route with the responsible local provider or manager.
Regional planning context: South Australian Tourism Commission — regional trip information ↗. Directory counts come from published YouDive records. Individual site claims remain subject to their source and review notes.
Dive sites in this region
Freshwater Lake/RiverMount Gambier Sinkholes & Caves
Blue Lake (Mount Gambier)
A 77 m volcanic crater lake that turns cobalt blue every summer – view only; diving prohibited.
Cave/CavernMount Gambier Sinkholes & Caves
Engelbrecht Cave – East
Cave diving beneath the middle of Mount Gambier – a shallow, silty 70 m passage to a hidden air chamber and lake.
Cave/CavernMount Gambier Sinkholes & Caves
Engelbrecht Cave – East Extension
Over 400 m of newly discovered, sidemount-only tunnel beneath Mount Gambier, reached through the Rabbit Hole and the Caterpillar.
Cave/CavernMount Gambier Sinkholes & Caves
Engelbrecht Cave – West
A 340 m Advanced Cave dive with an air chamber directly beneath Mount Gambier's Jubilee Highway.
Freshwater Lake/RiverMount Gambier Sinkholes & Caves
Ewens Ponds
A one-way drift through three gin-clear spring ponds over meadows of aquatic plants – easy, beautiful and open to Open Water…
Cave/CavernMount Gambier Sinkholes & Caves
Fossil Cave
A cave with a fossil record of thylacines, marsupial lions and giant kangaroos, connected to the Tank Cave system.
Sinkhole/CenoteMount Gambier Sinkholes & Caves
Kilsby Sinkhole
50 m-plus visibility in a cliff-walled sinkhole that Open Water divers can dive with an approved operator; midday light shafts…
Sinkhole/CenoteMount Gambier Sinkholes & Caves
Little Blue Lake
The easiest-access deep sinkhole in Mount Gambier – roadside parking, stairs and pontoon, and a flat floor at 36 m for depth and…
Sinkhole/CenoteMount Gambier Sinkholes & Caves
Piccaninnie Ponds
The approach to Australia's most famous sinkhole: weed meadows in near-perfect visibility leading to the lip of a 100 m+ chasm.
Cave/CavernMount Gambier Sinkholes & Caves
Tank Cave
More than 7 km of shallow, lined maze passage – Australia's premier Advanced Cave training and exploration site.
Sinkhole/CenoteMount Gambier Sinkholes & Caves
The Shaft
A single midday shaft of sunlight falling into a flooded chamber 140 m long – and the birthplace of Australia's cave-diving rules.
Cave/CavernMount Gambier Sinkholes & Caves
Three Sisters Cave
An 18 m belayed ladder descent into a 30 m dome chamber, with the infamous 30-40 cm 'flattener' beyond – sidemount only.
Cave/CavernMount Gambier Sinkholes & Caves
Allendale East Cave
A steep, silty township cave with a big chamber at 24 m – a true test of buoyancy and line skills for newly rated Cave divers.
Cave/CavernMount Gambier Sinkholes & Caves
Baker's Cave
A 15 m wire ladder down a 1 m solution tube into a large flooded chamber and tunnel to 33 m.
Sinkhole/CenoteMount Gambier Sinkholes & Caves
Goulden's Hole
The classic CDAA training sinkhole – compact, clear below a 15 m thermocline and easy to plan around.
Sinkhole/CenoteMount Gambier Sinkholes & Caves
Hancocks Cave
A 60 x 35 m bell-shaped cenote with collapse features, swim-throughs and a milky white-silt lower chamber – closed at present.
Cave/CavernMount Gambier Sinkholes & Caves
Iddlebiddy Cave
A long, wide single passage with flat ceilings, huge boulders and fragile tessellated clay – 'very easy' for competent cave…
Cave/CavernMount Gambier Sinkholes & Caves
Mud Hole
Crystal-clear shaded water for the first diver – and a textbook silt-out for everyone after.
Cave/CavernMount Gambier Sinkholes & Caves
Nettlebed Cave
A restrictive entrance into 'The Gallery' with archaeological markings, then boulder and clay chambers to 28 m.
Cave/CavernMount Gambier Sinkholes & Caves
Piccaninnie Ponds – The Cathedral
A white limestone chamber lit by daylight in near-perfect visibility – one of Australia's finest freshwater photography dives.
Sinkhole/CenoteMount Gambier Sinkholes & Caves
Piccaninnie Ponds – The Chasm
Hanging over a 100 m+ spring-fed slot in 40 m-plus visibility – the signature Mount Gambier image.
Cave/CavernMount Gambier Sinkholes & Caves
The Pines
A tight entrance opening into a large, clear chamber, with a signed deep Advanced Cave section below 25 m.
Sinkhole/CenoteMount Gambier Sinkholes & Caves
The Sisters
Twin sinkholes – a clearer northern wall dive and a southern hole with a dumped car, truck, cash register and bike.
Sinkhole/CenoteMount Gambier Sinkholes & Caves
Black Hole
The Black Hole is one of the Mount Schank sinkholes that has dropped off the active site list. The CDAA describes it as a large…
Details need confirmation