The Pinnacles lie off the north-western end of Montague Island. The Marine Life Network lists the site at 8–32 m for experienced divers only, describing kelp-covered shallows that drop away to a spectacular deep sponge garden. It is one of the deeper, more dramatic dives around the island.

The tops of the pinnacles are covered in kelp at 8–12 m, with blue groper, wrasse, sweep and leatherjackets. Below the kelp the rock faces fall into a sponge garden with sea whips, gorgonians and sea squirts in bright colours. The exposure to current brings in schools of yellowtail and pelagic fish such as kingfish, bonito and trevally, and grey nurse sharks, which aggregate on the northern side of the island in summer, may pass through. Seals from the nearby colony often join divers on the ascent.

The combination of depth and current makes this an Advanced dive. Operators choose it only when the current is manageable, and divers should be comfortable ascending in open water with an SMB. Dive profile and depth information is based on the Marine Life Network summary; local operators can supply more detail on the day. On a good day with blue water, it is one of the best deep reef dives on the South Coast. Montague is a nature reserve and part of the Batemans Marine Park, with fishing restricted in sanctuary zones. Expect to share the ascent with curious seals.

Boat access only. Narooma Charters leaves from the Narooma town wharf on Wagonga Inlet (about 25 minutes to the island) and Underwater Safaris from Narooma marina; private boats launch at the Apex Park or Bar Beach ramps inside the inlet. Every trip crosses the Narooma bar, one of the most dangerous on the NSW coast, so departures depend on bar conditions; Bermagui harbour (about 24 km by sea) is the fallback launch point.

The Pinnacles are at the north-western end of the island, one of the first areas reached from Narooma; the operator drops divers on the pinnacles when current allows.

Montague Island is about 9 km offshore and fully exposed, but with sites on all sides operators can usually find shelter from the wind of the day: the northern bays in southerlies, the western side in easterlies. The real limit is the Narooma bar, which closes in moderate easterly or southerly swell, especially on a run-out tide; McFadyen calls it probably the most dangerous bar in NSW. Trips are frequently delayed or cancelled, so allow spare days.

Currents are strong on the northern and eastern sides. The north-western end is exposed to the current that sweeps past the northern tip of the island, which is why the site is for experienced divers. It needs a gentle current and modest swell.

Descend onto the pinnacles through the kelp at 8–12 m, then drop down the face to the sponge garden at 20–30 m, working with the current. Ascend the pinnacle to finish in the kelp, and deploy an SMB if drifting off.

Dived by Underwater Safaris and Narooma Charters as conditions allow (Montague sites range 5–35 m). The Marine Life Network lists it for experienced divers only.