This dive site, the HTMS Hanhak Sattru 312, is a 44.9m long, 7m wide high-speed attack ship that served in the Royal Thai Navy's Gulf Patrol Fleet, built in Singapore. It was purposely sunk as an artificial reef and now rests approximately 60m north of Laem Thian, Koh Tao, at a maximum depth of 24 meters, with its mast reaching up to 13 meters. This wreck offers a captivating dive experience, allowing exploration of its exterior, bridge, and deck, which remains relatively intact. It is of the same class as the HTMS Suphairin 313, another popular wreck in the region.
As a recently established artificial reef, the HTMS Hanhak Sattru 312 is quickly attracting a diverse range of marine life. Divers can anticipate encountering schools of barracuda, trevally, and fusiliers gracefully circling the structure. Smaller inhabitants like damselfish, groupers, and snappers have already begun to colonize the wreck's many crevices, alongside various crustaceans. While extensive coral growth is still in its nascent stages, the wreck already serves as a thriving haven for a wide array of typical Gulf of Thailand reef fish.
The optimal period to explore this dive site coincides with Koh Tao's dry season, generally from February to October, which offers the best visibility and calm sea conditions. This wreck is well-suited for certified divers who possess good buoyancy control and are comfortable with the basics of wreck diving. Although internal penetration is not recommended for recreational divers, the exterior provides ample features for exploration. Freedivers can particularly enjoy the shallower mast section. This site is excellent for advanced training in wreck specialties and offers superb opportunities for wide-angle photography.
