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Portsea hole is a depression within the bed of the old Yarra River that has flowed through this area during periods of glaciation and lower sea levels.
The area is popular with divers and reaches depths of up to 30 metres. Portsea Hole acts as a shelter for a variety of fish and other reef species and the stratification of marine life on the wall provides special qualities as a dive site. It is one of the most popular deeper recreational dive sites in the bay.
Portsea hole is suitable for Advanced Open Water SCUBA divers (or equivalent). It is not suitable for snorkelling.