Lonsdale Arches

Victoria, Australia

Depth

20m

Visibility

4m - 12m

Entry

Boat

Experience Level

Beginner

Lonsdale Arches

Victoria, Australia

Depth

20m

Visibility

4m - 12m

Entry

Boat

Experience Level

Beginner

About Lonsdale Arches

Approximately 1 kilometre from the Point Lonsdale Lighthouse and clear of the shipping channel, just outside Port Phillip Heads is an amazing area of bommies or underwater rock formations, some appearing like underwater arches. The strong current flow in this area has created a nutrient rich environment and subsequently prolific marine growth and the associated marine life. But it is the amazing rock formations that make this dive site special. This site has a couple of amazing swim throughs that are very safe easy to enter. A favourite spot for catching Crays.

Lonsdale Arches Dive Info

Terrain & Features

Drop Off, Rock

Entry Type

Boat

Max Depth

20m

Visibility Range

4m – 12m

Experience Level

Beginner

Best Gas Mix

21% – 47%

O₂

CNS Load (35 min)

12% at 18m / 36%

O₂

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Marine Life

Crayfish

Weather Conditions

Water Temperature ℃

Dive Operators near Lonsdale Arches

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Location

Dive Site Hazards

Edge-Accelerated Currents — Currents often strengthen along drop-off edges.
Depth Perception Distortion — Visual contrast can distort perceived depth.
Terrain-Induced Descent — Divers may unintentionally follow terrain downward.

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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