Hin Dot is a great dive in just south of Phi Phi Don, and it is often called Chimney Rocks due to the four pinnacles that make up this dive site. The rocks start at about 5 meters and descend down to around 30 meters. The Chimneys are home to many large schools of fish, so many in fact, that they block out light from reaching the site, making it look darker than it actually is. The current is generally mild and it is a nice and easy dive suitable for beginners. As the topography is interesting and the marine life is abundant, this is a great site for divers of all levels.

The pinnacles are covered in many different types of corals such as hard corals, tube corals, and many purple and orange soft corals. This adds to the colour brought by the Christmas tree worms, and the clams, oysters, and giant clams found on the deeper spots.

As can be expected with pinnacles, the rocks have many ledges, crevices, and nooks and crannies, that can be explored as you descend into the dive. Large schools of fusiliers swim around the pinnacles and it is common to spot groupers, moray eels, and scorpion fish amongst the rocks and soft corals. The deeper parts of the pinnacles are home to trevallies in the hunt, barracuda, and nurse sharks.