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Mount Gambier

Iddlebiddy

  • CertificationFull cave
  • Water temperature≈ 14–16 °Cestimated, no reports yet
  • SpecialSidemount
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What it looks like

All 4 videos and posts

Videos and posts

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Other people's footage, not advice: how someone else dives here says nothing about what suits your team. Dive within your training.

The dive

The debris cone under the entrance holds human skull fragments, studied in 1988. Do not touch them.

Fragile clay, soft walls and a very silty end room: visibility can drop to zero quickly.
Source: CDAA – Iddlebiddy ↗
Profile and sections

The debris cone under the entrance holds human skull fragments, studied in 1988. Do not touch them.

Source: CDAA – Iddlebiddy ↗Source: Forestry SA – caving ↗
Depth and profile
About 250 m, one passage to the south-east ending in a very silty room; 100 m of new passage was reported in 2025. Depth not published.
Configuration
Two passages too narrow to swim side by side; fragile clay and soft walls (estimate: sidemount).
Who can dive where
  • CaveAt least Full cave
  • Whole caveConfigurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
  • Whole caveExperienced divers only · doesn't decide who may dive
Experienced diversPermission 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 – Iddlebiddy ↗Source: Forestry SA – caving ↗

How to get there

Forestry SA site (permit, closed on Total Fire Ban days), open to divers since 1990. CDAA rating: Advanced Cave.

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Around Iddlebiddy

FillsNo fill station known nearby
Other sites6

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Sources, sharing and disclaimer

Sources

Source: CDAA – Iddlebiddy ↗Source: Forestry SA – caving ↗

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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.