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Mount Gambier

One Tree (Mount Schank)

  • Max depth50 m
  • 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

Visibility is usually good below 20 m. You will find thermoclines, a harvester in the water and some rubbish.

Profile and sections

Visibility is usually good below 20 m. You will find thermoclines, a harvester in the water and some rubbish.

Source: CDAA – One Tree ↗
Depth and profile
About 50 m deep (Border Watch, 2017; not confirmed).
Configuration
Open sinkhole: every configuration (estimate).
Gas
Trimix from 40 m
Who can dive where
  • CaveAt least Cavern
  • Whole caveConfigurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
  • Whole caveGoes down to 50 m (trimix or deco may be needed) · doesn't decide who may dive
Permission 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 – One Tree ↗

How to get there

Large, deep sinkhole in a private paddock near Mount Schank. Collect the key at the house, show your CDAA card and sign the book; if nobody is home, the site is closed. CDAA rating: Basic Cave.

Plan your route ↗

Around One Tree (Mount Schank)

FillsNo fill station known nearby
Other sites6

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Sources, sharing and disclaimer

Sources

Source: CDAA – One Tree ↗

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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.