HTMS Chang wreck

The HTMS Chang Wreck is one of Thailand's most spectacular dive sites, a massive former Thai Navy landing craft ship intentionally sunk in 2012 off the coast of Koh Chang in the eastern Gulf of Thailand. At over one hundred meters in length and resting at a maximum depth of thirty-four meters, this is one of the largest diveable wrecks in Thai waters, and its size, dramatic profile, and rapidly developing marine community have made it a bucket-list dive for wreck enthusiasts visiting Southeast Asia. The HTMS Chang was decommissioned after decades of naval service and carefully prepared for its new role as an artificial reef. Hazardous materials were removed, access points were created for safe diver penetration, and the vessel was sunk upright on a sandy bottom within reach of advanced recreational divers. The result is a wreck that retains the impressive scale and military character of an operational warship while being accessible and diver-friendly. Descending to the HTMS Chang is an experience of growing scale and impact. The wreck's enormous bulk emerges from the green Gulf water gradually, the superstructure appearing first and then the full sweep of the hull revealing itself as you descend past the deck level. The bridge, radar mast, and gun platforms create a dramatic skyline that rises from the main deck, and swimming along the length of the vessel gives a visceral sense of its impressive dimensions. The warm Gulf waters have driven rapid marine colonization of the hull. Within its first years underwater, the Chang attracted an impressive community of soft corals, sponges, and barnacles. Hard coral recruitment is ongoing, and each year the vessel becomes more fully integrated into the marine environment. Fish have adopted the wreck enthusiastically, with enormous schools of batfish, snappers, and fusiliers swirling around the superstructure. Large groupers inhabit the internal spaces, and barracuda patrol the perimeter. Penetration diving through the Chang's prepared access points allows exploration of the bridge, engine room, crew quarters, and cargo holds. These interior spaces offer atmospheric wreck diving where shafts of light penetrate through portholes and openings, illuminating the marine growth that has established itself on every internal surface. The scale of the interior spaces, designed to carry troops and vehicles, is cavernous and deeply impressive. The thirty-four meter maximum depth means bottom time is limited on recreational gas mixes, and careful dive planning is essential. Most divers focus on specific sections of the wreck during each dive, building a comprehensive understanding over multiple visits. The depth, potential current, and size of the wreck all contribute to the advanced rating, and divers should be honest about their readiness before attempting this dive. The HTMS Chang has rapidly become one of Southeast Asia's must-dive wrecks. Its combination of enormous scale, accessible depth, growing marine community, and the dramatic setting off the forested coast of Koh Chang creates a wreck diving experience that stands alongside the best in the world.