Sanctum reef

Victoria, Australia

Depth

60m

Visibility

2m - 6m

Entry

Boat

Experience Level

Advanced

Sanctum reef

Victoria, Australia

Depth

60m

Visibility

2m - 6m

Entry

Boat

Experience Level

Advanced

About Sanctum reef

This is a rugged wall dive in the very middle of the main shipping channel inside Port Phillip Bay. Diving is only possible at Sanctum Reef on slack water at the end of the Ebb or outgoing tide, and even then only if no shipping is due through the heads for the next three hours. The top of the wall is 24 metres, and the wall itself runs east-west at this point then drops off to the south where it goes down to a depth of 60 metres. Check shipping timetables before proceeding on this dive.

Sanctum reef Dive Info

Terrain & Features

Reef, Drop Off, Deep

Entry Type

Boat

Max Depth

60m

Visibility Range

2m – 6m

Experience Level

Advanced

Best Gas Mix

—

CNS Load (20 min)

14% at 58m / 21%

O₂

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Marine Life

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Weather Conditions

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Dive Operators near Sanctum reef

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Location

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Dive Site Hazards

Hidden Depth Variations — Complex reef topography can conceal depth changes, leading to unintended profile variations.
Distraction from Marine Activity — High fish activity can distract divers and delay depth or gas awareness.
Rapid Surge Direction Changes — Surge near reef structures can reverse direction quickly, pushing divers sideways into unexpected areas.

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.

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.

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