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Koh Haa Yai
Koh Haa Yai
The biggest of the Haa islands is Koh Haa Yai. It is characterized by a steep cliff perpendicular to sea level that stretches all the way from above the water to depths of up to 30m. Koh Haa Yai is surrounded by reefs and the most famous dive spot is the rock wall at the south side of the island, which ends in a sandy bottom at 25-30m and is covered with a variety of soft corals, sea fans and hard coral.
There are two underwater caves on the southeast side. The entrance of the first cave is at a depth of 12m. As this cave gets narrower as you go deeper, cave penetration is not recommended unless divers have obtained cave specialty certification.
The second cave is actually a shallow cavern, and can be found to the left of the first. The entrance is split into two by a vertical rock plate, but the rest of the cave is spacious and well illuminated. The hall height of the cave is 2-3 m above sea level, so swimming to the surface from inside the cave is possible. This cave is also known as “The Cathedral” because of the blue light reflected from the surface. The exterior of the cave is covered with soft corals, sea whips and rock outcrops, ending in a sandy bottom at depths of 28-30m.