Great Blue Hole
水深はサイト上部から通常の最大深度までの範囲を示し、「推奨認定レベル」はオペレーターが一般的に求めるメインストリーム機関の資格レベルであり、法的な義務ではありません。流れと透明度は日々変化します——ここに掲載されている情報はすべて計画の目安としてご利用ください。
The Great Blue Hole is a dive into geology rather than fish life. From the surface it is the famous navy-blue iris in Lighthouse Reef's turquoise; underwater it is a fast, quiet elevator ride down a sheer wall to a ledge near 40 m where stalactites the size of tree trunks hang from an overhang — dripstone formed when this cavern stood above a lower Ice Age sea. Divers weave between the columns for a handful of minutes, often watched by circling Caribbean reef sharks, then begin the long staged ascent. Jacques Cousteau's 1971 expedition made it legend; discipline keeps it safe.
その瞬間のために: Swimming through 40 m stalactites, reef sharks in the bowl, one of diving's most famous single sites.
地形: A near-circular collapsed cavern about 300 m across and roughly 124 m deep; a shoulder of ancient stalactites overhangs the wall near 40 m.
流れ（カレント）: The bowl is still; the reef rim can carry light surge.
エントリー: Day boats cross from San Pedro or Caye Caulker (2–3 hours) or liveaboards moor at Lighthouse Reef; entry over the rim into the bowl.
エントリー前に知っておこう
危険生物・リスク: Depth is the whole hazard: narcosis at the stalactite ledge, minutes of no-deco time, and a featureless blue ascent. Follow the guide's profile exactly.
許可証＆ルール: Park entrance fee; most operators require proof of experience or a prior local dive.
保全: A Natural Monument within the UNESCO World Heritage reef system, managed with the Belize Audubon Society; fees fund protection.
出会える生物
水中フォトグラファー向け
ワイドアングル: ★★★★☆ · マクロ: ★☆☆☆☆ — 各撮影スタイルに対するこのサイトの評価（編集部による1〜5点）