Koh Haa Yai – The Twin Cathedral

/Koh Haa Yai – The Twin Cathedral
Koh Haa Yai – The Twin Cathedral

Project Description

Koh Haa YaiDestination Koh Rok and Koh Haa

Koh Haa Yai – The Twin Cathedral

  • Distance: 75 kilometers

  • Boat trip: Liveaboard or Speedboat
  • Depth: 5 – 30 meters

  • Experience: advaced

  • Reef type: Swim through, reef slopes, wall

  • Visibility: Variable 15 to 30 meters

  • Current: Variable, mild

  • Corals: Soft coral, hard coral, sponge, sea fans
  • Fish: Lion Fish, moray eels and big shoals of snappers and barracudas
  • Highlights: Sea horse, sting ray, leopard sharks, swim through

The biggest of the Haa islands is Koh Haa Yai.lIt is characterised by a steep cliff perpendicular to sea level that stretches all the way from above the water to depths of up to 30 m. 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 25-30 m and is covered with a variety of soft corals, sea fans and hard corals.
There are two underwater caves on the southeast side The entrance of the first cave is at a depth of 12 m. As this cave gets narrower as you go deeper, cave penetration is not recommended unless divers have obtained cave diving certification. The second cave is actually a shallow cavern and can be found to the east 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 28-30 m. Leopard sharks and Kuhl’s sting- rays are often found around the sandy bottom. Juvenile lobsters and a variety of nudibranchs can be spotted around crevices at the cliff, especially at the entry of the cave. Look closely, you may also find ghost pipefish camouflaged among sea fans or soft corals! Schools of squid and yellowtail barracuda are normally seen near the surface close to cave’s entry, Reflection from schools of copper sweepers can be seen when you shine a light into the cave. Hawksbill turtles have also been spotted in the area.

The Cathedral is the highlight of this divesite. Seeing the sunlight penetrating the cave and illuminating it with blue light as you ascend is an unforgettable experience. However, in the unlikely case of strong surges or high waves, divers should avoid going inside the cave because they may find themselves be pushed against the cave wall and may suffer injury from sharp rock outcrops or stings from residents on the walls. The first cave, on the other hand, is smaller, narrower and more complex. Penetration into this cave is strongly not recommended unless the diver has obtained Cavern Diving certification, or is in training with a qualified instructor.

Koh Haa Yai is often dived on a Phi Phi Overnight Trip or Liveaboard Trip to the south Andamansea.

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