North Twin

The Twins are a pair of outlying islands toward the archipelago's western edge, and North Twin is the busier sibling: granite boulder fields rolling down to submerged heads where gorgonians grow to armspan and glassfish smoke the gullies. Trevally and mackerel raid from open water, potato-sized nudibranchs decorate the rock, and mantas or a passing whale shark reward boats that linger in the right weeks. The diving is unfussy, big terrain, moderate depths, current enough to keep fish interested, which makes it the itinerary's reliable middle act between the southern tunnels and Black Rock's main event.

您此行的高光时刻: Armspan gorgonians on granite, raiding pelagics, dependable mid-trip quality

地形地貌: Granite boulder slopes and submerged pinnacles off a small island

危险因素: Current on the exposed heads and open-water position.

保育: Rarely more than one boat present; keep it looking that way on the reef itself.

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）。