Nippo Maru

The Nippo Maru is the lagoon's cabinet of curiosities, a freighter that went down loaded for garrison resupply. A light tank still perches on the deck, gun barrels and howitzer carriages lie nearby, and the holds carry water tanks, shells, and crates that have fused into single rusted masses. The bridge is the famous frame: helm and engine telegraph standing in open water, instruments legible under the growth. Everything interesting sits below 30 m, so this is a dive of choices made quickly and gas watched closely — the wreck teaches discipline as surely as history.

その瞬間のために: The deck tank; the standing bridge telegraph and helm; artillery pieces and garrison cargo in the holds.

地形: Hull with a list to port on lagoon floor at roughly 48 m

エントリー: Descend the mooring to the bridge and plan the dive around limited bottom time.

危険生物・リスク: Depth is the governing hazard; narcosis at working depth; munitions in the holds; short no-deco windows invite overstay.

保全: Protected historic site; the artifacts photographed today exist because previous divers left them — extend the same courtesy.

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）。