Punta Sur — Devil's Throat

Devil's Throat is Cozumel's rite of passage: a coral tunnel that swallows the group in single file, bends downward through the dark, and spits you out on the open wall around 40 m with blue in every direction. The passage itself is short but committing — no turning a group around mid-tube — and the surrounding Punta Sur reef keeps the drama going with deep cuts, black coral, and the chance of a reef shark cruising the point. Bottom time is brief and the ascent is a long, scenic decompression-style drift up the wall shoulder.

その瞬間のために: The tunnel exit at 40 m, cathedral-like passages, black coral, big-animal potential at the point.

地形: Steep coral promontory riddled with tunnels; the Throat is a narrowing passage that exits on the wall face near 40 m.

流れ（カレント）: Current at the island's southern tip can be unpredictable and switch with the tide.

エントリー: Exposed southern site; dived only when conditions allow, with prompt descents onto the reef shoulder.

危険生物・リスク: Overhead passage, depth at the exit, short no-deco window, current at the point. Not a dive for the unpracticed.

保全: Marine-park site; guides limit group sizes through the tunnels.

ナイトロックス: ここでは効果的です——このエリアのプロファイルは、ナイトロックスが無減圧潜水時間を有意に延ばせる水深帯にあります（適切なトレーニングを受けていることが前提です）。