German Channel

The German administration blasted this cut through Palau's barrier reef before WWI to shorten the phosphate route from Angaur, and the ocean has been improving it ever since. Tidal water moving through the channel concentrates plankton at the seaward mouth, and reef mantas commute in to feed and to hover over coral-head cleaning stations while wrasses work their gills. Divers settle low on the sand at a respectful distance and wait; on good days mantas circle for an entire dive, with gray reef sharks and garden eels as supporting cast.

您此行的高光时刻: Reef mantas at cleaning stations, best from about December to March; shark traffic in the channel mouth; snapper and barracuda on the tide.

地形地貌: White-sand channel floor flanked by coral slopes and scattered bommies

水流: Tidal flow through the dredged cut; outgoing water carries lagoon murk, so trips are timed for the cleaner phases.

入水方式: Dives set up on the seaward mouth of the channel, usually around cleaning stations on the sand.

危险因素: Boat traffic transiting the channel; reduced visibility on the outgoing tide; long shallow swims if the mantas move.

保育: Kneel only on bare sand, never on the cleaning stations, and let mantas control the distance — chasing ends the encounter for every boat present.

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）。