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The Great White Wall is Rainbow Reef's most famous dive site, a steep wall below 20 metres where white soft corals (Dendronephthya) cover virtually every surface in cascading formations. The entry involves swimming through a short tunnel in the reef that opens onto the wall face, which is blanketed in white corals that sway gently in the current. The visual effect is stunning and unique — few other places on Earth display this density of white soft coral. The wall drops to beyond 40 metres, but the best coral coverage is between 18 and 30 metres. Current is typical and can be strong during tidal changes.

The dry season from April to October generally offers the best conditions with calmer seas, better visibility, and more comfortable surface conditions. Water temperatures during this period range from 25 to 27 degrees Celsius. The soft corals are present year-round, but they display most dramatically when the current is running, as the polyps extend to feed. Tidal changes produce the best current conditions, and experienced operators time dives accordingly. The wet season from November to March brings warmer water but increased rainfall, occasional cyclone risk, and reduced visibility from runoff.

Taveuni has a small airport with daily flights from Nadi and Suva operated by Fiji Airways. Alternatively, a ferry runs from Suva to Taveuni several times per week, though the journey takes over 14 hours. From the airport, dive resorts arrange transfers. Several dedicated dive resorts operate on Taveuni, all offering daily trips to Rainbow Reef in the Somosomo Strait. The boat ride from most resorts to the dive sites takes 15 to 30 minutes. Dive packages that include accommodation, meals, and diving are the standard arrangement.

The white soft corals at White Wall are Dendronephthya species that thrive in the nutrient-rich currents flowing through the Somosomo Strait between Taveuni and Vanua Levu. These filter-feeding corals extend their polyps fully when the current is running, creating the signature snow-white blanket effect. The wall's orientation and the strait's funnelling effect deliver a constant supply of plankton, allowing the white corals to dominate this particular section while neighbouring walls host more colourful varieties.

White Wall is a current-dependent dive and is only dived when conditions are favourable. The Somosomo Strait generates strong tidal currents that can change direction rapidly. Dive operators time descents to catch the incoming current, which opens the soft corals and brings pelagic visitors. Divers need solid drift diving experience, the ability to make negative entries, and comfort with using reef hooks. The site is not suitable for beginners, and even experienced divers should follow their guide's instructions precisely.