Castle Rock
Protected Area
Port Phillip Heads
Why dive here
With 129+ marine species recorded in the area - including blue sharks, blue whales, dolphins, dwarf minke whales and great white sharks - Castle Rock offers some of Victoria's richest reef diving.
Four Sponges, over on the east end of Sandy Bay, is one of those sites we keep coming back to. The reef top sits around 10-14 metres, just right for a relaxed glide, and the wall itself drops to 22 metres. We love drifting along here, letting the gentle current do the work. The site gets its name from a quartet of truly enormous barrel sponges, which feel ancient, almost like they’re watching you. Poke around the crevices and you’ll find plenty of action. We’ve seen broad shad hanging out, and our favourite, the tiny saddled blennies, poking their heads from their coral hidey-holes. Look for clinging crabs tucked into the reef, their eyes on stalks, and the subtle beauty of a hamlet or a rusty goby. Visibility is generally excellent, around 20-25 metres, and it’s a site that suits everyone from newer divers to those looking to refine their buoyancy along the wall.
Typical Castle Rock Dive Profile
Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.
Safety Notes
Always perform a 3-minute safety stop at 5m before surfacing.
Reviews for Castle Rock
Conditions
Ocean conditions, forecast and tides for Castle Rock
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