Vertigo

The name describes the view: a wall that falls away beneath your fins into featureless blue while gray reef and blacktip sharks circle within arm's length. Operators have long used this corner of the western barrier for shark dives, and years of provisioning history mean the residents approach boats and divers with unnerving confidence — briefings cover hand positions for a reason. Even on quiet days a dozen sharks may attend, with dogtooth tuna and trevally cruising deeper. The clarity of the open Pacific gives the whole encounter a floodlit quality that channel dives on Yap cannot match.

您此行的高光时刻: Gray reef and blacktip sharks at close quarters; exceptional outer-reef visibility; the sheer drop that named the site.

地形地貌: Steep outer-reef wall dropping from a shallow lip into deep blue water

水流: Usually gentle on the wall; surge over the reef flat in swell.

入水方式: Outer-reef site near the northwest channel mouth; enter on the wall and settle along the lip.

危险因素: Bold, close-approaching sharks; an unforgiving drop-off for buoyancy lapses; surge on the lip in swell.

保育: Sharks here are habituated to boats — keep hands tucked, follow the guide's positioning, and let the animals set the distance.

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）。