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Mount Gambier

Three Sisters (Glencoe)

  • Max depth35 m
  • CertificationFull cave
  • Water temperature≈ 14–16 °Cestimated, no reports yet
  • SpecialSidemount
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Directions

Diving and fills

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The dive

There is broken glass in the chamber. The cave was first described in 1933.

Hard entry via an 18 m wire ladder and a 30–40 cm flattener: belay, helmet and someone at the top are required.
Source: CDAA – Three Sisters ↗
Profile and sections

There is broken glass in the chamber. The cave was first described in 1933.

Source: CDAA – Three Sisters ↗
Depth and profile
After the ladder a rock pile and a 30–40 cm high flattener into a 30 m dome chamber; ~35 m deep.
Configuration
Sidemount only. CDAA rating: Advanced Cave.
Who can dive where
  • CaveAt least Full cave
  • Whole caveConfigurations: Sidemount / Small cylinders / no-mount (speleo sumps)
  • Whole caveGoes down to 35 m (trimix or deco may be needed) · doesn't decide who may dive
  • Whole caveRopework (SRT) needed
  • Whole caveExperienced divers only · doesn't decide who may dive
RopeworkExperienced diversPermission needed

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 – Three Sisters ↗

How to get there

Near Glencoe on Mile Hill Road, on Wattle Range Council land; key from the Glencoe post office and bistro. Never park across the road: it breaches the lease. Through a 1 m concrete pipe and an 18 m free-hanging wire ladder; belay at the entrance and helmets required, at most 4 divers in the water, one person at the top. CDAA rating: Advanced Cave.

Plan your route ↗

Around Three Sisters (Glencoe)

FillsNo fill station known nearby
Other sites6

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Sources, sharing and disclaimer

Sources

Source: CDAA – Three Sisters ↗

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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.