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Geoff's Hole

Geoff's Hole

Victoria, Australia

Depth
Depth Icon

40m

Visibility
Visibility Icon

3m - 8m

Entry
Boat Entry Icon

Boat

Experience Level

Advanced

Geoff's Hole

Victoria, Australia

Geoff's Hole
Depth
Depth Icon

40m

Visibility
Visibility Icon

3m - 8m

Entry
Boat Entry Icon

Boat

Experience Level

Advanced


About Geoff's Hole

Discovered and named after one of the great local diving identities 'Geoff' - this dive site is close inshore to Point Nepean and can only be dived when there is no current, otherwise known as slack water. The shallowest section runs south-west to north-east with the deeper section to the south-east. There have been reports that the wreck of a couta boat can be seen in this area, but with continual tidal sand movement it may be covered up. Will you see the wreck? This is a great deep dive for an advanced or deep diver course and makes a nice change to Portsea hole. A great dive to do during strong southerlies, as this area is quite sheltered.

Geoff's Hole Dive Info

Terrain & Features

Wreck, Deep, Rock

Entry Type

Boat

Max Depth

40m

Visibility Range

3m 8m

Experience Level

Advanced

Best Gas Mix

21% – 28%

O2

13% at 38m / 29%

O2
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Marine Life

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Location

Dive Site Hazards

  • Deceptive Entry Openings — Openings may become restrictive inside due to angle, collapse, or corrosion.

  • Surge-Induced Internal Silt Shift — Internal surge can move silt and debris without direct contact.

  • Partial Overhead Environment — Many wrecks limit direct ascent even without full penetration.

  • Fine Rust Particle Silt-Out — Disturbed rust particles can rapidly reduce visibility.

  • Gradual Narcosis Onset — Narcosis may develop slowly, making self-assessment unreliable.

  • Task Fixation at Depth — Cognitive narrowing at depth can reduce awareness of time and ascent rate.

  • Increased Gas Density Breathing Load — Higher gas density at depth increases work of breathing.

  • Bubble Trapping Under Overhangs — Rock overhangs can trap exhaled bubbles, reducing visibility and causing disorientation.

  • Reflected Surge Patterns — Surge reflecting off rock faces can create irregular and unpredictable water movement.

  • Current Funnel Effect — Narrow gaps between rocks can accelerate water flow unexpectedly.

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