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Sue's Grotto

Sue's Grotto

Victoria, Australia

Depth
Depth Icon

27m

Visibility
Visibility Icon

3m - 8m

Entry
Boat Entry Icon

Boat

Experience Level

Unknown

Sue's Grotto

Victoria, Australia

Sue's Grotto
Depth
Depth Icon

27m

Visibility
Visibility Icon

3m - 8m

Entry
Boat Entry Icon

Boat

Experience Level

Unknown


About Sue's Grotto

At the very northern end of the Lonsdale reef systems lies Sue's Grotto. Named in tribute to the memory of one of the local divers of this area. Only accessible to divers at slack water, the shot line is dropped at a depth of approximately 16 metres on the northern edge of the bommie. Swimming north from the shot you drop over the edge and can descend to a maximum depth at the base of the bommie of 27 metres. The sea bed is covered in strange round rocks the size of cannonballs. You can then follow the wall around to either the south-east or the south-west. Crayfish are abundant in the south-east. Great dive with lots of fish and lots of lovely soft corals and sponges.

Sue's Grotto Dive Info

Terrain & Features

Wreck, Deep, Rock

Entry Type

Boat

Max Depth

27m

Visibility Range

3m 8m

Experience Level

Unknown

Best Gas Mix

21% – 38%

O2

13% at 25m / 36%

O2
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Marine Life

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Location

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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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