HTMS Sattakut Wreck

Koh Tao · Surat Thani Province · Thailand

The HTMS Sattakut sits upright on the sandy bottom off Koh Tao's southwest coast, a 48-metre former Thai Navy landing craft steadily transforming into a thriving artificial reef since it was deliberately sunk in 2011. The wreck lies at 30 metres at its deepest, with the radar mast reaching approximately 18 metres, making it a comfortable two-level dive for Advanced certified divers. The descent drops you onto the bow, and the vessel's scale becomes immediately apparent. The hull is intact and perfectly upright, its grey steel softened by a growing carpet of hard and soft corals, barrel sponges, and anemones. Yellowtail barracuda hang in formation above the superstructure. Batfish orbit the mast in lazy circles. Giant groupers have claimed the darker recesses as territory, their massive bodies wedged into corners with an air of permanent residency. Penetration opportunities are a major draw. The wheelhouse is open and accessible, with large windows providing natural light and easy exits. Corridors below decks lead to compartments where lionfish hover in shadows and giant moray eels coil in pipes. The deeper holds are darker and more confined, suited to divers with wreck specialty training. Every year the wreck becomes more colonised, so repeat visits reveal new growth and residents. Outside, the surrounding sand rewards exploration. Blue-spotted ribbontail rays bury themselves near the hull, Jenkins whipray patrol the perimeter, and pipefish hide among debris. Schools of snapper and fusilier sweep past, and the occasional trevally rockets through to pick off stragglers. The Sattakut has added a genuinely different dimension to Koh Tao's diving, giving the island a wreck site with enough depth, structure, and marine life to keep experienced wreck divers entertained. It is a testament to how quickly the ocean turns cold steel into something alive.