Côn Đảo

The dive scene is small and shaped by the national park. A handful of operators work out of Con Son town, boats leave for a two-dive day with a beach or island stop in between, and park entry and any landing permits for the outer islets are arranged by the operator rather than by you. Wind direction, not a site list, decides where you end up: crews move between the sheltered and exposed sides of the group as the season turns, and a day can be called off outright when swell wraps around the islands.

Diving is shallow and unhurried. Fringing reef runs off the islets in broad hard-coral gardens that slope gently into sand, rock and seagrass, and dives inside the 5 to 25 metre band can run long on a single tank. The exposed sides have boulder shorelines with more structure and more water movement, but nothing here is a wall or a proper drift; the interest is coral cover and the animals grazing it. Visibility moves with the season and with plankton, and rarely holds steady across a whole week.

It rewards divers content with a short site list and thin support on land. A cancelled boat costs a whole day out of an already narrow window, rental gear runs to limited sizes, and there is no recompression facility on the island. Most people fold diving into a wider trip, since the prison museums and Hang Duong cemetery draw much of the island's visitor traffic and the park's turtle programme is an evening out in its own right. It is quiet, shallow and low-pressure, and wrong for anyone chasing depth, current or a guaranteed headline animal.