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Nullarbor

Olwolgin Cave (Roe Plain)

  • Max depth10 m
  • CertificationFull cave
  • Water temperature≈ 17–24 °Cestimated, no reports yet
  • SpecialSidemount
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Directions

Diving and fills

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What it looks like

All 4 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

The water is green and tannin-stained, with haloclines, black bacteria and roots. Divernet called Olwolgin Australia's longest underwater system in 2015.

Tight, silty passages: after silting out it can take days for visibility to return. Toxic air above the water in places.
Source: CDAA – Olwolgin ↗Source: Divernet – Cave diver (Olwolgin) ↗
Profile and sections

The water is green and tannin-stained, with haloclines, black bacteria and roots. Divernet called Olwolgin Australia's longest underwater system in 2015.

Source: CDAA – Olwolgin ↗Source: cavediving.net.au – Olwolgin ↗Source: CDG – Weebubbie, Olwolgin and Burnabbie (2012) ↗
Depth and profile
Shallow, ~10 m. Upstream ~2,700 m and downstream ~7,200 m (CDAA); by January 2015, 11,000 m had been surveyed downstream, with a maximum penetration of 2,814 m.
Configuration
Sidemount only: no backmount and no back-mounted rebreather. Tight, silty passages.
Who can dive where
  • CaveAt least Full cave
  • Whole caveConfigurations: Sidemount / Small cylinders / no-mount (speleo sumps)
  • Whole caveGoes down to 10 m (trimix or deco may be needed) · doesn't decide who may dive
  • Whole caveExperienced divers only · doesn't decide who may dive
Experienced 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 – Olwolgin ↗Source: cavediving.net.au – Olwolgin ↗Source: CDG – Weebubbie, Olwolgin and Burnabbie (2012) ↗

How to get there

On the Roe Plain below the Hampton Tableland; manager Department of Planning, Lands and Heritage (apply 4 weeks ahead). A 1.3 km bush walk and a scramble to a small pool. Sidemount only, no training, and every diver needs at least 25 sidemount dives in Cave or Advanced Cave sites after Advanced Cave. CDAA rating: Advanced Cave.

Plan your route ↗

Around Olwolgin Cave (Roe Plain)

FillsNo fill station known nearby
Other sites6

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Sources, sharing and disclaimer

Sources

Source: CDAA – Olwolgin ↗Source: cavediving.net.au – Olwolgin ↗Source: CDG – Weebubbie, Olwolgin and Burnabbie (2012) ↗

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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, visitor permit), cavediving.net.au, CDG reports (caves.org.au), Buzzacott & Skrzypek (2021), Divernet, Shearwater (Pannikin, 2023), DBCA, the Shire of Dundas, the Royal Flying Doctor Service, Fiona Stanley and Royal Adelaide hospitals, DAN, SA Parks and the Federal Court (Mirning, 2017). No coordinates are published for any dive cave: no pins, drive times from Cocklebiddy Roadhouse approximate. The certification per cave is an estimate from the CDAA rating; you also need that rating and written permission from the land manager.