Gaol Reef, better known locally as Turtle Wall, sits directly off the beach below the historic Trial Bay Gaol and is South West Rocks' easiest and most family-friendly dive: a shallow, low-relief reef that snorkellers and first-time divers alike can reach without a boat and explore without any real current or depth concern. The site's name comes from its most reliable residents — juvenile green and hawksbill turtles that use the shallow reef as a nursery area, often approachable at close range, alongside both adult and juvenile wobbegong sharks resting in the open on the sand and rock rather than tucked deep into crevices, making this one of the better spots on the coast for a guaranteed wobbegong sighting without any real search effort. Beyond the turtles and wobbegongs, the reef holds pufferfish, porcupinefish, stingrays, shovelnose rays and a mixed assortment of small reef fish typical of the area's blended temperate-subtropical fauna.

Depths rarely exceed ten metres and much of the interesting activity sits in three to six metres, well within safe limits for an open-water-level diver or a confident snorkeller, and the flat sand-and-rock bottom removes any real navigational challenge. Because it needs no boat, no permits and very little planning, Turtle Wall functions as South West Rocks' default introductory dive site — used for training dives, family snorkelling trips and as a relaxed, guaranteed-wildlife outing on days when swell or wind rules out the more demanding boat sites further offshore, and it remains a genuinely worthwhile dive for experienced divers too given how reliably the turtles and wobbegongs turn up.

Trial Bay shore sites are reached via Arakoon / Trial Bay Gaol Road, off the southern side of South West Rocks. Park at the Trial Bay Gaol camping ground or the roadside pull-offs along the bay and carry gear a short distance (50-150 m) down to the sand or rock entry points. Entry is a simple sandy-beach wade or a rock-hop over the shore platform depending on the exact spot and swell; check conditions from the headland first as the bay can have surf and rip movement in onshore weather.

Trial Bay is sheltered from southerly swell by the South West Rocks headland but exposed to the north-east; best in light winds and under 1 m swell. Visibility can be limited close to shore, especially after rain runoff from the Macleay River.

Wade in from the beach below Trial Bay Gaol and swim a short distance to the reef, staying shallow (3-6 m) to work the rock platform where juvenile turtles and wobbegongs are most often found; suitable for a slow, unhurried exploration rather than a set route.

South West Rocks Dive Centre and Fish Rock Dive Centre both run guided dives and snorkel trips here for beginners and families; easily independently diveable in calm conditions.