Iro Maru

The Iro was a fleet oiler of the 1920s generation, a 143-meter tanker built in 1922 to keep warships fueled at sea. By early 1944 she was running supplies through an emptying empire. On 22 March the submarine USS Tunny put a torpedo into her bow; she limped into Palau's anchorage for repairs, and was still there on 30 March when Operation Desecrate One — the Palau counterpart to Truk's Hailstone raid — swept in. Carrier aircraft left her burning, and she went down upright in the sheltered water southwest of Koror. She has aged into one of Palau's signature wreck dives. Her kingposts rise like coral chimneys toward the light, a bow gun still sits on its bandstand platform above the torpedo-crumpled plating, and the aft superstructure opens into shadowy, manageable spaces. Between world-famous reef days, she is where Palau divers go to remember that the war passed this way too.

沈没の経緯: Torpedoed by USS Tunny in March 1944, then sunk at anchor by carrier aircraft during Operation Desecrate One, 30–31 March 1944.

コンディション: Upright and whole, with lagoon sediment softening her lines; the bow damage from the torpedo is still legible.

洞窟貫通（ペネトレーション）: Limited. The aft deckhouse and engine-room skylights admit trained wreck divers; deep machinery spaces are dark, oily, and best left alone. オーバーヘッド環境への進入には専門的なトレーニングが必要です——最低限、レック・ダイビング認定資格が必要で、完全貫通には技術的なレック・トレーニングが求められます。

推奨ライセンス: Advanced Open Water with deep experience

流れ（カレント）: Mild · 透明度: 10–20 m

海洋生物: Soft corals and oysters crust the kingposts, batfish and barracuda circle the masts, and lionfish hold the gun platform.

危険生物・リスク: Lagoon visibility can drop with wind and tide; silt inside; residual oil films in overhead spaces.

Palau's wrecks are protected historic sites; permits through licensed operators apply.

Palau law forbids removing anything from its historic wrecks.