The Jibbon reef complex is a cluster of deep reefs discovered by McFadyen and the St George Scuba Club from the 2000s onward, named in a running joke after fast-food outlets – because such outlets are always found near one another. Pizza Reef, named because it is round, came first; KFC, Maccas, Hungry Jacks, Red Rooster and Oporto followed as the club found neighbouring reefs, often by accident when wind pushed the boat off the intended mark. Maccas Reef was found by accident when wind pushed the St George Scuba Club boat north-east of the intended Pizza Reef mark, and McFadyen named it after McDonald's – not himself – because of its fast-food neighbours.

He rates it one of the best dives he has done in Sydney. The reef comprises two sections separated by sand. A prominent wall runs north-east to south-west near the mark, north–south beyond it and east–west to the south-west, dropping from 22 m to 24–25 m and then sloping to almost 27 m on sand.

The reef top is at 21–22 m. A flatter northern section extends about 350 m, confirmed on the sounder. Small boulders, gullies, overhangs and cracks add structure, and the whole reef is covered in very large sponges, small gorgonians and many sea squirts.

The fish life is prolific: huge schools of silver sweep, yellowtail and one-spot pullers, with leatherjackets, bastard trumpeter, blue morwong and bream. Cuttlefish, weedy sea dragons, Port Jackson sharks, eastern blue devilfish and seals are all seen, as are donut nembrotha nudibranchs on purple ascidians. Visibility is usually excellent.

At 24–27 m bottom time is limited to about 25 minutes on air, so nitrox is a real advantage, and several dives are needed to cover both sections. There is no charter; it is a private-boat or club dive. It suits experienced Advanced divers.

Boat only. Launch in Port Hacking (Gunnamatta Bay/Tonkin Park at Cronulla, Lilli Pilli or Bundeena ramps) and run out through the entrance; the Jibbon reef complex lies just east and south-east of Jibbon Bombora, 5–10 minutes from the ramps. Go out of Port Hacking and turn right once past Jibbon Bombora.

McFadyen's approximate GPS is 34° 04.8945' S 151° 10.8284' E. Anchor near the wall on the reef top at 21–22 m.

These reefs sit just outside Port Hacking, exposed to swell from the north-east through the south-east, with some southerly wrap past Jibbon Bombora; plan on seas under about 1.5 m. At 20–27 m they are below most surge once down, but anchoring needs moderate conditions. Water quality is good because the adjacent Royal National Park contributes little runoff, and visibility is usually 12–20 m; heavy prolonged rain can bring dirty water out of Port Hacking on the ebb.

Westerly and north-westerly winds give the best days.

From the anchor follow the prominent wall south-west for about five minutes, then return and explore the flatter northern section, which runs about 350 m, coming back along the reef top.

Nitrox (EAN28–32) recommended; bottom time on air about 22–29 min.

No regular charter – private boat or dive-club (St George Scuba Club) only; no charter boat currently operates out of Port Hacking.