Split Bommie is a compact but distinctive rock formation within the sheltered Nursery area on the western side of Julian Rocks, easily recognised by the narrow crevice or split running through it that gives the feature its name. Sitting in the same gentle 5-12 m depth range as the rest of the Nursery, it is an easy add-on for divers already exploring that side of the island rather than a stand-alone destination, and it is frequently pointed out by instructors running open-water course dives in the area. The split itself creates a small sheltered channel that concentrates fish life in the same way larger trenches do elsewhere at Julian Rocks: bullseyes and small schooling fish shelter inside, wobbegong sharks are regularly found tucked along its base, and the surrounding boulders carry the same rich covering of sponges and soft corals typical of the Nursery more broadly.

Turtles pass close by on their way between resting spots, and the site's shallow depth and negligible current make it comfortable for less experienced divers and useful for extended, unhurried photography. Split Bommie does not carry the drama of the island's larger swim-throughs at the Cod Hole or Cray Cave, and it is not marketed as a headline site in its own right, but its combination of easy access, shelter and reliable small-scale fish activity makes it a worthwhile few minutes on any Nursery dive. Because it sits within the broader Nursery mooring area rather than having its own dedicated mooring, most divers encounter it as part of a wider drift around the western side of the island rather than a fixed destination.

Both Byron Bay dive operators launch small rigid-hull inflatables directly off the beach: Sundive Byron Bay from The Pass, Byron Bay Dive Centre from near Wategos/Clarkes Beach; check in first at the shopfront in town, then walk down to the beach for the boat launch briefing.

Julian Rocks sits fully exposed 2.5 km off Byron Bay; a big easterly or south-easterly swell closes the outer sites but the Nursery side can often still run. Visibility can change from 5 m to 20 m within a single day as warm and cool currents meet around the rocks. Summer (Dec-Mar, 21-26°C) brings leopard sharks and mantas; winter (Jun-Aug, 18-21°C) is cooler but usually clearer, with grey nurse sharks and migrating humpback whales.

From the Nursery mooring, swim a short distance to the bommie, work slowly around and through the split looking for wobbegongs and schooling bullseyes, and continue the dive across the surrounding boulder garden.

Sundive Byron Bay (The Pass) and Byron Bay Dive Centre (Wategos/Jonson St) both run daily boat dives to Julian Rocks.