Great Wall (Bloody Bay)

The Great Wall is Bloody Bay's thesis statement. You cross a strip of bright sand in snorkel depth, and then the island simply stops: a face so vertical that looking down produces the small electric lurch of standing on a rooftop ledge. The wall's skin is packed — vase sponges, wire corals, tunicate constellations — and its shallow start means the spectacle works at any depth you choose, including from the surface with a mask. Groupers escort divers along the lip; turtles fly past below like commuter traffic. Few walls anywhere begin so shallow and end so absolutely.

您此行的高光时刻: A sheer face beginning at 6 m, sponge-packed vertical terrain, wall scenery accessible even to snorkelers.

地形地貌: The reef shelf ends at about 6 m in a wall that drops vertically — undercut in places — into abyssal blue.

入水方式: Moored inside the marine park; a short swim crosses the sand shelf to the lip.

危险因素: The shallow lip hides an instant transition to great depth; set and hold a floor.

保育: Bloody Bay Marine Park is mooring-only with strict no-take rules; its condition is the argument for them.

高氧（Nitrox）: 在此值得使用——各潜点深度落在富氧空气（nitrox）能有效延长免减压时间的区间（前提是持有相应认证）。