Divers come from all over the world for Vanuatu's superb visibility, warm water and world-class dive sites. The underwater world offers plunging cliffs, grottoes and overhangs plus huge caves and intricate tunnels and life abundant over all this making for a visual feast. Divers can be surrounded by sea fans, soft corals and acropora gardents, plate corals, sponges and thousands of curious fish. But the true drawcard for diving in Vanuatu is the SS "President Coolidge" - the largest wreck dive in the world. This 22,000 ton luxury liner converted to troop ship sank fully laden during the war, just a few metres off the beach. The front holds are jammed with the machinery of war. Guns, helmets, gas masks and personal effects are scattered across the promenade deck and bow. The Coolidge is suitable for novice and advanced divers with novices able to dive the shallow sections of the wreck. Most reefs begin in shallow water (ten metres or less) and drop away to varying depths.