SS President Coolidge

No other wreck of this stature starts at the end of a beach path. The Coolidge — a 1930s trans-Pacific luxury liner carrying over 5,000 troops when she struck friendly mines in October 1942 — was run toward shore and now lies on her side down a slope that lets divers build depth day by day: jeeps and rifles in the forward holds first, then the medical stores, the guns, and eventually the first-class smoking room where the porcelain relief of a lady and unicorn has become a pilgrimage object. Nearly all aboard survived; two men did not, and guides tell their story. A week here feels like reading a very large book properly.

その瞬間のために: The Lady at depth; cargo holds full of 1942; a shore-entry giant that rewards repeat dives.

地形: A 198-meter liner-turned-troopship lying on her port side down a sandy slope, bow around 20 m, stern beyond 60 m

エントリー: Walk in over a coral flat minutes from Luganville and follow the guide line down to the bow; all diving is guided by local rule.

危険生物・リスク: Depth accumulates fast on a guided tour; silt, cables, and true overhead in the interior; deep sections are decompression dives in fact if not in name — treat them so.

保全: Protected under Vanuatu law with two lives lost in the sinking — artifacts stay, and local guiding rules exist to keep both wreck and divers whole.

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）。