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Mount Gambier

The Sisters Sinkhole

  • CertificationCavern
  • Water temperature≈ 14–16 °Cestimated, no reports yet
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Directions

Diving and fills

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The dive

Two sinkholes under one name (5L43/44). Little is published about them.

Profile and sections

Two sinkholes under one name (5L43/44). Little is published about them.

Source: CDAA – The Sisters ↗Source: Parks SA – cave diving sites (bookings) ↗
Depth and profile
Depth not published.
Configuration
Sinkhole: every configuration (estimate).
Who can dive where
  • CaveAt least Cavern
  • Whole caveConfigurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
Permission neededEntry or dive fee

This is how the planner decides who in your team may dive this cave. Rules your own trip adds (organizer, a mail, the AI) show with your trip.

Source: CDAA – The Sisters ↗Source: Parks SA – cave diving sites (bookings) ↗

How to get there

Sinkhole on DEW land; booking and rules as at Gouldens Hole (Parks SA, at least 48 hours ahead). Not to be confused with the Three Sisters near Glencoe. CDAA rating: Basic Cave.

Plan your route ↗

Around The Sisters Sinkhole

FillsNo fill station known nearby
Other sites6

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Sources, sharing and disclaimer

Sources

Source: CDAA – The Sisters ↗Source: Parks SA – cave diving sites (bookings) ↗

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Certification requirements, configurations and trimix depths are estimates for planning. Always check them locally and dive within your training. Compiled from web research (Oct 2026): the Cave Divers Association of Australia (site list, site pages, training and visitor permit), Parks SA, Forestry SA, Wikipedia, the heritage summary of Fossil Cave, cavediving.net.au, CDG reports (caves.org.au), Divernet (2025), the City of Mount Gambier, the Royal Adelaide Hospital, DAN and the dive shops' own websites. Pins only where Wikipedia gives coordinates; the CDAA publishes none. The certification per site is an estimate from the CDAA rating; you always need that CDAA rating as well. Check everything with the CDAA.