Koh Haa Yai is famous for its caves, caverns and canyons. The maximum depth found here is 45 +meters and there are plenty of deeper pinnacles to explore so Koh Haa Yai is well suited for more advanced recreational divers and technical divers. Because of the versatility of Koh Haa Yai, there are also plenty of shallow areas for more inexperienced divers and snorkelers.
The visibility is always good and often 30 meters with only slight to moderate currents, which makes diving here very pleasant. The amazing visibility combined with amazing marine life such as Scorpionfish, Turtle, Ghost pipefish, Moray eel and Whalesharks, all spotted on a single dive which makes amazing diving. The speciality of Koh Haa Yai are the caves and caverns that provide an amazing underwater scenery for diving and photography.