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Mount Gambier

Hells Hole

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

Diving and fills

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What it looks like

All 1 videos and posts

Videos and posts

From other divers, via YouTube, Instagram and Facebook. They only load when you click; after that, Google's or Meta's privacy rules apply.

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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

Variable visibility and a lot of tree debris in the water.

Profile and sections

Variable visibility and a lot of tree debris in the water.

Source: CDAA – Hells Hole ↗Source: Forestry SA – caving ↗
Depth and profile
Depth not published.
Configuration
Sinkhole: every configuration, but everything has to go down ~30 m (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 – Hells Hole ↗Source: Forestry SA – caving ↗

How to get there

Forestry SA site: permit through Forestry SA, closed on Total Fire Ban days. Key from the Mount Gambier Visitor Information Centre. The sinkhole drops ~30 m to the water; how you get in is not on the CDAA page: ask. CDAA rating: Basic Cave.

Plan your route ↗

Around Hells Hole

FillsNo fill station known nearby
Other sites6

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Sources, sharing and disclaimer

Sources

Source: CDAA – Hells Hole ↗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.