The Big Scare (Bat Islands)

The Big Scare is Costa Rica's most honest adrenaline dive: no cage, no bait, just bull sharks on their own terms. Divers descend quickly to the sand at 25-30 m off the Bat Islands, settle low with hands folded, and wait while heavy females - some visibly pregnant in season - materialize out of the green-blue and make deliberate, unhurried passes, sometimes close enough to count scars. Guides run the protocol strictly: grouped divers, no reaching, controlled ascents. Between shark passes, devil rays and eagle rays work overhead and big cubera snapper loiter. The season runs roughly May to November, when seas allow the long run north from Playas del Coco.

您此行的高光时刻: Unbaited bull sharks at depth, disciplined small-group protocol, wild northern-corner setting

地形地貌: Volcanic rock and sand flats around the Bat Islands' outer pinnacle

水流: Exposed volcanic rock off the Santa Elena Peninsula; surge and current are part of the package.

危险因素: Depth with short no-deco windows, current and surge, large predators requiring strict compliance with the briefing.

保育: Within Santa Rosa National Park's marine sector; operators carry park permissions and follow encounter 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）。