HABA visit sites located on Tongue, Sisters, Opal, Chinaman, St Crispins and Agincourt Reefs. All of the sites are located close to the outer edge of the Great Barrier Reef. This ensures clear oceanic water to give the best in visibility and marine diversity. The Skipper selects each site according to the weather and tidal conditions in order to give you the best possible visibility and comfort during your reef experience.