Koh Tachai Pinnacle

South of Koh Tachai island, a granite dome crests around 12 m and takes the full force of the Andaman's tidal exchange, which is precisely why everything gathers there. Trevally spiral in dense chimneys, barracuda hold formation up-current, batfish wander the terraces, and both mantas and whale sharks transit often enough to keep every diver glancing at the blue. The diving is work: pull down the line, tuck behind granite, move in the lulls. The island's famous beach has been closed to tourism since 2016 for recovery, but this offshore pinnacle remains on liveaboard schedules, conditions permitting.

您此行的高光时刻: Trevally tornadoes in ripping flow, manta and whale-shark transits, big-current craft

地形地貌: Submerged granite dome with boulder terraces

水流: Among Thailand's strongest-current sites; some slots are simply undiveable and crews wait for the tide.

入水方式: Descents run down a fixed line to the dome; in strong flow, crews stage negative entries and shorten the plan.

危险因素: Severe current, down-eddies off the dome's flanks, and blue-water ascents; SMB and line discipline are mandatory.

保育: Koh Tachai's land closure is a park recovery measure; the pinnacle stays open under standard park rules.

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）。