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

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

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

  1. Is the proposed activity open water or an overhead environment?
  2. Who manages access and where can we check current rules?
  3. 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

Find local operators
SAYouDive mascot illustration; not a photograph of the siteFreshwater Lake/River

Mount Gambier Sinkholes & Caves

Blue Lake (Mount Gambier)

A 77 m volcanic crater lake that turns cobalt blue every summer – view only; diving prohibited.

ShoreUp to 77 m
SAYouDive mascot illustration; not a photograph of the siteCave/Cavern

Mount 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.

ShoreUp to 8 m
SAYouDive mascot illustration; not a photograph of the siteCave/Cavern

Mount 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.

ShoreUp to 22 m
SAYouDive mascot illustration; not a photograph of the siteCave/Cavern

Mount Gambier Sinkholes & Caves

Engelbrecht Cave – West

A 340 m Advanced Cave dive with an air chamber directly beneath Mount Gambier's Jubilee Highway.

ShoreUp to 12 m
SAYouDive mascot illustration; not a photograph of the siteFreshwater Lake/River

Mount 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…

ShoreUp to 10 m
SAYouDive mascot illustration; not a photograph of the siteCave/Cavern

Mount Gambier Sinkholes & Caves

Fossil Cave

A cave with a fossil record of thylacines, marsupial lions and giant kangaroos, connected to the Tank Cave system.

ShoreUp to 15 m
SAYouDive mascot illustration; not a photograph of the siteSinkhole/Cenote

Mount 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…

ShoreUp to 65 m
SAYouDive mascot illustration; not a photograph of the siteSinkhole/Cenote

Mount 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…

ShoreUp to 42 m
SAYouDive mascot illustration; not a photograph of the siteSinkhole/Cenote

Mount 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.

ShoreUp to 10 m
SAYouDive mascot illustration; not a photograph of the siteCave/Cavern

Mount Gambier Sinkholes & Caves

Tank Cave

More than 7 km of shallow, lined maze passage – Australia's premier Advanced Cave training and exploration site.

ShoreUp to 30 m
SAYouDive mascot illustration; not a photograph of the siteSinkhole/Cenote

Mount 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.

ShoreUp to 124 m
SAYouDive mascot illustration; not a photograph of the siteCave/Cavern

Mount 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.

ShoreUp to 35 m
SAYouDive mascot illustration; not a photograph of the siteCave/Cavern

Mount 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.

ShoreUp to 24 m
SAYouDive mascot illustration; not a photograph of the siteCave/Cavern

Mount 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.

ShoreUp to 33 m
SAYouDive mascot illustration; not a photograph of the siteSinkhole/Cenote

Mount Gambier Sinkholes & Caves

Goulden's Hole

The classic CDAA training sinkhole – compact, clear below a 15 m thermocline and easy to plan around.

ShoreUp to 26 m
SAYouDive mascot illustration; not a photograph of the siteSinkhole/Cenote

Mount 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.

ShoreUp to 37 m
SAYouDive mascot illustration; not a photograph of the siteCave/Cavern

Mount Gambier Sinkholes & Caves

Iddlebiddy Cave

A long, wide single passage with flat ceilings, huge boulders and fragile tessellated clay – 'very easy' for competent cave…

ShoreDepth not recorded
SAYouDive mascot illustration; not a photograph of the siteCave/Cavern

Mount Gambier Sinkholes & Caves

Mud Hole

Crystal-clear shaded water for the first diver – and a textbook silt-out for everyone after.

ShoreUp to 17 m
SAYouDive mascot illustration; not a photograph of the siteCave/Cavern

Mount Gambier Sinkholes & Caves

Nettlebed Cave

A restrictive entrance into 'The Gallery' with archaeological markings, then boulder and clay chambers to 28 m.

ShoreUp to 28 m
SAYouDive mascot illustration; not a photograph of the siteCave/Cavern

Mount 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.

ShoreUp to 35 m
SAYouDive mascot illustration; not a photograph of the siteSinkhole/Cenote

Mount 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.

ShoreUp to 110 m
SAYouDive mascot illustration; not a photograph of the siteCave/Cavern

Mount Gambier Sinkholes & Caves

The Pines

A tight entrance opening into a large, clear chamber, with a signed deep Advanced Cave section below 25 m.

ShoreUp to 30 m
SAYouDive mascot illustration; not a photograph of the siteSinkhole/Cenote

Mount 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.

ShoreUp to 20 m
SAYouDive mascot illustration; not a photograph of the siteSinkhole/Cenote

Mount 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…

ShoreDepth not recorded
Details need confirmation