Cathedral Cave

The dive is a boat dive in Waterfall Bay, and it starts at the cave mouth: a massive entrance where the maximum water depth is 21 metres. Scale is the first thing you register, and the operator's claim for the site is exactly that, the biggest sea cave system in Australia. Past the entrance the single open void starts breaking down into smaller chambers.

From there the system runs back into narrow tunnels and cross passages, so the route is a question of which branch the conditions and the group's experience allow rather than a fixed circuit. The walls are covered with brightly coloured invertebrates of a kind normally found in much deeper water. This is an overhead environment, so the dive is about moving slowly and staying off the rock rather than covering ground.

The centre pairs the caves with canyon dives on the same stretch of coast: varied invertebrate life, swim-throughs and walls, with open water overhead instead of a ceiling. Those are what it offers divers who are not ready for an overhead environment, though they still want good diving skills and reasonable buoyancy control, and the operator does not run them for novices.