Halliburton

The Halliburton is Utila's classroom at depth. Sunk deliberately in 1998, the little freighter stands upright and complete on the sand — mast, wheelhouse, holds — with the tidy proportions of a training diagram, which is how half the island's advanced and wreck students come to know her. Grey angelfish patrol the rails, a moray or two keeps office hours in the machinery, and the anchor line descent through blue haze to a materializing shipwreck delivers the small theater that makes wreck diving addictive. Interior passes are short and prepared, but silt punishes lazy fins.

その瞬間のために: Compact upright wreck, textbook deep and wreck training profiles, moody mast-in-the-haze descents.

地形: A small cargo ship scuttled for divers in 1998, upright on sand at about 30 m with the deck near 20 m.

エントリー: Buoyed site a short run from the harbor on the sheltered south side; descend the mooring line to the deck.

危険生物・リスク: Depth near the recreational edge and enclosed spaces; penetration needs training and a guide.

保全: Utila's principal artificial reef; leave the growth undisturbed for the classes behind you.

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）。