Cathedral
Depth is the range from the top of the site to its usual maximum; "recommended cert" is the mainstream-agency level operators usually ask for, not a legal rule. Currents and visibility change daily, so treat everything here as planning ranges.
Cathedral is Aliwal's set-piece: a sunken amphitheater roofed at one end by a broad rock arch, with a clean sand floor that lets divers kneel in the nave while the congregation arrives. In season, ragged-tooth sharks cruise beneath the arch and stack up in the still water; the classic Aliwal photograph is a raggie silhouetted in the arch's frame. Out of season the architecture still earns the visit: soldierfish and sweepers under the roof, potato bass making inspections, rays on the sand, and the shoal's endless nudibranch inventory on the walls. Surge management is the only real skill required.
The moment you come for: The arch-framed raggie silhouette; a natural amphitheater made for wide lenses
Topography: Sandstone amphitheater with a large natural arch and sand floor
Current: Swell-driven surge moves through the arch on bigger days; calm windows make the amphitheater easy.
Know before you splash
Hazards: Surge through the arch and depth on the seaward side.
Permits & rules: Aliwal Shoal MPA permit required, arranged via operators.
Conservation: Sand-kneeling only, and never under a shark's swim line: exits must stay open for the animals.
Nitrox: Worth it here: profiles sit in the range where enriched air meaningfully extends no-stop time (with the training to use it).
Who you'll meet
Sand Tiger (Ragged-Tooth) Shark
Nudibranchs
Loggerhead Turtle
Spotted Eagle Ray
Clownfish & Anemonefish
Leaf Scorpionfish
Lionfish
Marbled Ray
Also recorded nearby
"Charted here" species were listed by our editors from the sources on this page. Counts are GBIF occurrence records: observations logged within about 5 km of the charted position since 1990, matched only against the species in our catalogue. They show what has been seen there, not a promise of what you will see.
For photographers
Wide angle: ★★★★★ · Macro: ★★☆☆☆ (editors' 1–5 rating of what this site gives each style of shooting)