Maldives — Central Atolls

A day is built around the dhoni, the flat wooden workboat that carries tanks, compressor and crew while guests stay on a resort or a mothership. Resort centres typically run a two-tank morning and an afternoon dive; liveaboards add a night dive and move between anchorages overnight, so the boat is somewhere new by breakfast. Briefings are short and specific because the guide picks the line rather than the diver, and entries onto a channel corner are often negative, straight down before the flow takes hold.

The geography repeats itself in a way worth learning. Each atoll is a ring reef broken by channels, and every site is a variation on that shape: an outer slope facing open ocean, a channel mouth where water pours in or out with the tide, or a coral pinnacle standing inside the atoll, called a thila where its top stays well submerged and a giri where it rises into the shallows. Channel dives are fast and pelagic. Pinnacles carry the colour, with overhangs, soft coral and cleaning stations, and the shallowest sit calm enough for anyone.

The set piece is a hooked-in channel dive on incoming water: hanging over the sand while grey reefs hold station in the flow and jacks stack along the edge. Mantas run their own version on the pinnacles, circling low over coral heads while cleaner wrasse work them, and guides pick which side of an atoll to try from where the monsoon is pushing plankton, broadly the western side in the dry months and the eastern side in the wet. Off South Ari's outer reef, whale sharks are usually spotted from the boat and snorkelled at the surface rather than found on a dive.

It suits divers who are comfortable being led. Buoyancy counts for more than depth experience, since much of the work is holding a level in moving water and staying with the group so the dhoni can collect everyone at the end. Newer divers are usually kept to the sheltered inner pinnacles and reef tops, and the resort format makes it easy to travel with non-diving company. Anyone who wants back-to-back channel dives will get more from a liveaboard, which can follow conditions across several atolls in a week.