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Mount Gambier · about 14 km from Port MacDonnell

Little Blue Lake

  • Max depth42 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 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 usually murky, but it can clear below 20 m. There is rubbish on the bottom, including a 1966 car.

Poor visibility and a floor beyond 40 m: plan your depth; the CDAA recommends at most 40 m on air.
Source: CDAA – Little Blue Lake ↗Source: CDAA – Basic Cave ↗
Profile and sections

The water is usually murky, but it can clear below 20 m. There is rubbish on the bottom, including a 1966 car.

Source: CDAA – Little Blue Lake ↗Source: Wikipedia – Little Blue Lake ↗
Depth and profile
Open sinkhole ~50 m across with 8 m cliffs; ~36 m deep on average, just over 42 m at most (varies with the water table).
Configuration
Open water over a deep floor: 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 42 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 – Little Blue Lake ↗Source: Wikipedia – Little Blue Lake ↗

How to get there

On Mount Salt Road near Mount Schank, ~20 km south of Mount Gambier; also a public swimming spot with stairs and a pontoon. Easy entry from the roadside. CDAA rating: Basic Cave.

Plan your route ↗

Around Little Blue Lake

FillsNo fill station known nearby
Where to sleepAround Port MacDonnell on Booking.com ↗

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Other sites6 within 26 km

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Sources, sharing and disclaimer

Sources

Source: CDAA – Little Blue Lake ↗Source: Wikipedia – Little Blue Lake ↗

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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.