Big Wall is a Passions of Paradise site on Norman Reef, recommended by the operator in gentle northerly winds. The wall starts at 4-6 m and descends to 28 m, and its standout feature is unique finger-like formations created by wind and wave action, long spurs of coral that project from the wall with channels between them. Passions lists small sharks, turtles and pelagic fish, and says the site suits all experience levels, because the wall's shallow top lets novices and snorkellers enjoy it while experienced divers can use its full depth.

The finger formations are what make the dive memorable. They create a series of ridges and gullies along the wall, each gully a sheltered pocket where fish gather, and the ridges carry dense hard coral on their tops with softer growth and fans on their shaded sides. Following the wall through the fingers gives constant variety in light and topography.

Small reef sharks cruise the base, turtles rest on ledges, and pelagic fish, trevally, mackerel and occasionally tuna, sweep in along the outer edge. Schools of fusiliers and surgeonfish are usually present. Because the wall runs from shallow to deep, the dive can be run as a multi-level profile that makes good use of gas and no-decompression time.

Big Wall is often paired with Alan's Wall, the other Passions wall on Norman. For photographers, the finger formations make striking wide-angle subjects, especially with a diver silhouetted in a gully and sunlight filtering down from the shallow top. Visibility is typically 15-25 m.

Boat access only. Cairns day boats leave from the Reef Fleet Terminal (1 Spence Street) and the neighbouring Marlin Marina on the city waterfront, with check-in between about 7:00 and 8:00 am; most operators run transfers from city and northern-beaches accommodation, and there is paid parking near the terminal. The run of about 58 km out through Trinity Inlet and across the lagoon to Norman Reef takes around 82 minutes on a fast catamaran and noticeably longer on slower dive boats or into a south-easterly chop.

Big Wall is a Passions of Paradise mooring used in gentle northerlies; Cairns Dive Adventures lists it among Norman sites. Enter from the stern steps.

The prevailing south-east trade winds (typically 15-25 knots from April to September) are what limit Cairns outer-reef diving: above about 25 knots trips may be cancelled, and exposed eastern moorings are used only in light winds. Summer northerlies are gentler but make north-facing moorings choppy. Box jellyfish and Irukandji are present from about November to May (stinger suits on every dive), and the cyclone season runs November to April, when a system in the Coral Sea can close the reef for days.

Visibility drops after heavy rain and strong winds; spring is usually calmest and clearest. Most Norman moorings lie on its protected western side. Big Wall is best in gentle northerlies and is generally a spring and summer site; it is less suitable in fresh south-easterlies.

Descend the wall from its top at 4-6 m to your planned depth (18-20 m for most), then follow it with the reef on one shoulder through the finger-like formations. Turn at a third of your gas and return shallower, finishing at the top of the wall for a safety stop.

Passions of Paradise – day trips, best in gentle northerly winds; Norman is also worked by Divers Den (Ocean Quest liveaboard), Reef Experience, Aqua Quest, Down Under Cruise & Dive, Reef Encounter and Passions of Paradise; the mooring used on any day is chosen by the skipper according to wind, tide and other boats