Koh Haa Yai – The Twin Cathedral
Distance: 75 kilometers
- Boat trip: Liveaboard or Speedboat
Depth: 5 – 30 meters
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.
Diving Trips in Phuket Thailand
Same, same but different – we don’t cut any corners and much less during our Phuket diving day trips. Join and find out the little extra and unexpected. Scuba Diving in Phuket
- Phuket / Similan Islands Combo Dive Package – 6 Days – 15 Dives
- The Classic Similan Islands Trip – 4 Days / 4 Nights
Diving in Phuket Thailand
I want to see Sharks, Mantas and Turtles – You need to be lucky, but as a passionate diver you hopefully will enjoy also all the other great and rare creatures at Phuket’s popular dive sites. Let yourself amaze about the bunch of various marine life and the divine underwater landscape.
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