HTMS Sattakut

The Sattakut had two careers separated by an ocean. Launched in 1944 as a US Navy landing craft infantry — one of the flat-bottomed troop carriers built by the hundred for the island war — she saw Pacific service before being transferred to the Royal Thai Navy in the late 1940s, which kept her working as a patrol vessel for decades under the name Sattakut. When her service finally ended, the navy donated the hull, and on 18 June 2011 she was cleaned and scuttled a short boat ride from Koh Tao's western shore, near the pinnacle of Hin Pee Wee. She sits upright on the sand, bow gun still mounted and pointing into the green, wheelhouse doorways cut wide for safe swim-throughs. On an island that certifies more new divers than almost anywhere on earth, she has become the standard first wreck: deep enough to matter, small enough to circle twice, and reliably escorted by batfish.

沈没の経緯: Decommissioned and deliberately scuttled off Koh Tao on 18 June 2011 as an artificial reef.

コンディション: Young, tidy, and intact, with sponge and oyster growth accelerating each season.

洞窟貫通（ペネトレーション）: Limited. Prepared openings allow supervised passes through the wheelhouse and deck spaces; the lower hull silts and is left to wreck courses. 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

流れ（カレント）: Mild · 透明度: 5–20 m

海洋生物: Batfish escort divers on the line, snapper and fusiliers stream over the gun, porcupinefish loiter in the wheelhouse, and groupers hold the shadow under the stern.

危険生物・リスク: Visibility swings widely with season; multiple training groups can crowd the mooring; mind gas at a site deeper than the island's reefs.

An artificial reef stays complete only if every diver leaves it so.