The Caves is one of Sunreef's four core local sites and one of the shallowest dives on the Gneering Shoals. Sunreef describes a shallow ledge that drops 1-3 m to a sandy bottom, with a maximum depth of only 12 m, covered in seaweeds and marine life – 'a beautiful spot for divers of all levels, even those who are training'. GoodDive lists 'The Cave' at 10-12 m with interesting ledges, gutters and swim-throughs.

Despite the name, there are no true caves – the 'caves' are undercuts and overhangs along the ledge, and short swim-throughs where boulders lean together. These overhangs give the site its life: wobbegongs rest under them, crayfish and bullseyes crowd into the darker recesses, and large schools of surgeonfish move along the ledge. Sunreef notes that rays visit the ledge to be cleaned by small fish, and turtles are regular. GoodDive adds pelagic fish and leopard sharks from October to May.

The shallow depth means long bottom times, and the simple layout – follow the ledge, return along the top – makes navigation easy. It is a staple for Open Water training and a relaxed second dive for experienced divers, and a good place to look for nudibranchs on the algae-covered rock.

In a northerly or easterly swell the shallowness means some surge, but the site is generally forgiving and is often chosen when conditions rule out deeper reefs. Night dives here, when run, reveal crayfish, octopus and sleeping fish in the overhangs. Because it is shallow and close to the other inner-reef sites, the Caves is also a sensible choice for the second dive of a Brisbane double.

Mooloolaba's dive boats leave from The Wharf on the Mooloolah River (Parkyn Parade, Mooloolaba), about 1.5 hours' drive north of Brisbane via the Bruce Highway and Sunshine Motorway. Scuba World's shop is about 40 m from its boat, with 100+ free all-day parking spaces nearby; Sunreef departs from the same precinct. Boats run down the calm river, cross the Mooloolah River mouth beside Point Cartwright and head north-east to the reefs – about 15 minutes to the Inner Gneerings and Mudjimba Island.

Private boats can launch at the Mooloolaba (Parkyn Parade/Lions Park) ramps. Operators choose between sites on the day according to swell and current.

The Mooloolaba reefs are open-ocean sites with no shelter from the south-east trade winds or easterly swell. Operators generally cancel when winds exceed about 20 knots or swell makes the river-mouth crossing and moorings unsafe; they confirm trips by email and text around 3.30 pm the day before. Northerly winds (common on summer afternoons) also make the reefs choppy, so morning trips are more reliable.

Visibility averages about 12 m offshore (range 3-30 m) and is clearest after southerly winds and in winter; it drops after easterly blows and heavy rain. Winter (June-October) brings 19-21°C water, grey nurse sharks and humpback whales; summer (November-May) brings 25-27°C water, leopard sharks and lower visibility.

Descend to the ledge and follow it along the sand at 10-12 m, checking under the overhangs for wobbegongs and the ledge face for cleaning stations where rays stop. Turn on a third of your gas and return along the top of the ledge.

Sunreef Mooloolaba – double reef dives most days, rotating between Mudjimba Island, Nurse Rock, Hanging Rock and Caves; Scuba World Mooloolaba – reef double dives rotating through the Gneering Shoals and Mudjimba sites; SubSurface Scuba – Sunshine Coast reef double dives.