Playa del Carmen Bull Shark Dive

Each winter, female bull sharks — many visibly pregnant — gather over the sand flats off Playa del Carmen, and a dive industry has grown around kneeling quietly at 22 m while they patrol past. On a good December morning a line of divers may count a dozen animals moving in slow, heavy circles through the green-blue water. Some operators use bait to hold the sharks close, a practice that remains genuinely controversial in town; observation-style dives without feeding show calmer behavior and are the more defensible choice. Encounters are probable in season, never promised.

その瞬間のために: Close passes from mature bull sharks, seasonal aggregation, minutes from the beach.

地形: Flat sand and rubble plain at 20–25 m off the town beach.

流れ（カレント）: Open coastal water; current varies daily and dives run as slow drifts or anchored observation lines.

エントリー: Short panga ride off Playa del Carmen beach; negative entry and direct descent to the sand in season.

危険生物・リスク: Large predators at close range plus depth and current; hold the line formation, keep hands folded, and abort calmly if behavior changes.

保全: The aggregation is believed linked to gestation; choose operators who brief hard, skip feeding, and support local shark-protection efforts.

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）。