Rose Wall is named for the rosy-coloured hard coral that carpets it. Where most walls are a patchwork of coral, sponge and bare rock, here a solid sheet of pinkish hard coral covers the wall from about 16 m down to 35–40 m, a continuous growth that Diveplanit describes as 'solid coral 16–35 m'. The official Cocos tourism listing gives the recreational depth range as 6–30 m, with the reef top at around 6 m and the wall face the main event.

The site sits right next to Cabbage Patch on the sheltered north-western side of the atoll, and the two are often dived as a pair – the golden monoculture of Cabbage Patch in the shallows and the rose-coloured wall below. The colour is best appreciated with a torch or strobe: at 20 m natural light turns everything blue, and a beam brings back the pink and mauve tones. Fish life is typical of a healthy grazing reef.

Schools of surgeonfish and parrotfish work along the face and the reef top, scraping algae and coral, and a steady procession of tropical reef fish – butterflyfish, angelfish, wrasse and damsels – moves across the coral. Out in the blue, grey reef sharks and trevally patrol, and the endemic Cocos pygmy angelfish can be found in the reef crevices. It is not a dramatic, overhanging wall of the kind found on Christmas Island; rather it is a steep slope of living coral, and the pleasure is in the sheer extent and health of the coral cover.

Because the coral continues well past 30 m, the main discipline is depth control: it is easy to follow the colour downward. Most divers hold 18–25 m, which gives good colour and reasonable no-decompression time. Current is usually mild, but it runs with the tide through the nearby Western Boat Passage, so Cocos Dive sets the direction of the dive on the day.

The site suits Open Water divers comfortable on a wall and experienced divers who want a relaxed, colourful dive; photographers should bring wide-angle and strobes.

Fly to West Island on the twice-weekly Virgin Australia service from Perth (usually routed via Christmas Island; allow 7–10 days on the islands to absorb weather and flight delays). Cocos Dive collects divers from West Island accommodation in the morning (pickup around 8 am, departure about 9 am) and runs its boats from West Island into the lagoon. The north-western sites around Horsburgh Island are among the closest to West Island: the boat runs north up the inside of the lagoon past the northern tip of West Island towards Horsburgh, a short, usually sheltered ride.

Moorings or live-boat drops are used; there is no shore access. The lunchtime surface interval is normally taken on the beach at Direction Island before the second dive.

Cocos has two seasons. The south-east trades blow steadily from roughly April/May to October, often 15–25 knots, which chops up the lagoon and pushes swell onto the eastern and southern outer reefs; divers are then kept to sheltered sites. The doldrum season (November to March/April) brings lighter, variable winds, flatter seas and the widest choice of outer-reef sites, and is the best time to dive, though it is also the tropical cyclone season and squalls pass through.

The north-western rim sits in the lee of the atoll during south-east trade winds, so these sites are often the ones that stay diveable when the trades blow; a strong westerly or north-westerly swell (uncommon, mostly in the doldrum season or with passing cyclones) closes them. Tidal flow through the Western Boat Passage near Horsburgh sets up currents along the reef edge, so dives are timed with the tide; visibility is best on the incoming tide when clear oceanic water pushes in.

Descend on the reef top at 6–10 m and move to the wall edge, then drop to 16–25 m where the rose coral cover is continuous. Swim with the wall on one shoulder with the tide, keeping an eye on depth since the coral carries on below 30 m. Turn at half gas, rise gradually along the wall and finish on the reef top for the safety stop.

Cocos Dive (Dieter Gerhard, West Island, operating since 1990) is the only scuba operator on the islands and the only way to dive this site. It runs seasonal two-dive day trips with lunch and a surface interval on Direction Island, maximum 10 divers per trip; sites are chosen on the day according to wind, tide and diver experience. Trips book out well ahead and courses are currently suspended, so arrive certified.