Portsea Hole, Protected dive site in Port Phillip, Australia.
Portsea Hole is a protected dive site in Port Phillip featuring a large submarine depression. The seafloor drops from shallower water into a steep wall that descends to 32 meters below the surface.
The underwater formation developed from an ancient river channel during the last ice age when sea levels were far lower. This geology shaped the seafloor structure that divers encounter today.
The marine reserve holds deep significance for the Wathaurung and Boon Wurrung Aboriginal peoples of the area. Visitors diving here encounter spaces that matter to these communities.
Access requires advanced diving skills and boats depart from a nearby pier to reach the site. Visitors should prepare for underwater conditions and only explore with qualified guides.
The limestone walls contain small overhangs that shelter uncommon fish species and various marine creatures. These recesses host specialized wildlife found nowhere else in the area.
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