The Pinnacle is Forster's flagship grey nurse shark dive, a submerged rock formation rising from the sandy sea floor a short boat run offshore, and it has built a reputation to rival Fish Rock and Seal Rocks for sheer shark numbers: aggregations of fifty or more grey nurse sharks, some measured up to four metres, have been reported holding around the structure, making it one of the most reliable large-aggregation sites on the entire NSW coast. The pinnacle sits in a depth range of roughly 24 to 33 metres, deep enough to require solid buoyancy control and a genuine advanced-diver comfort level, and its position on open sand means the sharks and the accompanying schools of kingfish and jewfish are visible clearly against a plain, uncluttered backdrop rather than tucked into complex reef structure. Beyond the resident sharks, the site has a track record of more unusual pelagic visitors passing through — marlin and hammerhead sharks have both been recorded here on occasion, a reminder that Forster sits at a point on the coast where warmer subtropical water and cooler temperate water regularly mix.

The scale of the shark aggregation, combined with the pinnacle's straightforward, easy-to-navigate shape, makes this one of the standout dives on the mid-north coast for divers specifically chasing a big-number grey nurse encounter, and it is dived daily by Forster Dive Centre when conditions allow. Because the depth sits toward the deeper end of recreational limits, it suits confident, experienced divers rather than those newly certified, and dive guides will typically brief a conservative bottom time to keep well within no-decompression limits given the numbers involved and the temptation to linger.

Boats depart from Forster Dive Centre's base at Tuncurry (30 Manning Lane) or the Forster/Tuncurry boat ramp on Wallis Lake, running out through the lake entrance to the open sites. Forster-side sites (Latitude Rock, The Pinnacle, Bennetts Head Bommie) are 10-25 minutes away; Seal Rocks sites are a longer run of roughly 45-60 minutes further south, or reached by launching a boat directly from the Seal Rocks/Sugarloaf Point boat ramp for a much shorter trip.

Forster and Seal Rocks sit on an open, exposed stretch of coast with limited shelter — trips are cancelled in significant easterly swell or strong wind, and operators generally want under 1.5-2 m swell to run safely, especially for the Seal Rocks sites given the longer, more exposed run. Visibility is typically best in autumn and winter (15-30 m) and can drop after East Coast Lows or heavy rain from the Wallis Lake/Myall Lakes catchments. Grey nurse sharks are present through most of the year with the largest aggregations typically reported over the cooler months.

Descend the mooring line onto the pinnacle at around 24 m and work around its base and any gutters where sharks are holding, keeping a respectful distance and staying alert for kingfish, jewfish and the occasional marlin or hammerhead in the blue. Ascend gradually and finish with a safety stop on the shallower part of the structure.

Forster Dive Centre (Tuncurry) — daily boat trips to Forster and Seal Rocks sites, year-round.