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Diving Thailand – Dive Sites Thailand – Scuba Diving Similans
 
Name Twin Cathedral Koh Haa
Depth 5-35m
Vis 10-50m
Water Temp 26-30c
Level Beginner+
Our Rating 4 Stars
Best Time to Visit November to May
GPS 07-25-33N 98-53-19E
   
  Map of Local Dive Sites
Twin Cathedral Koh Haa

Koh Haa Yai is the largest of the Koh Haa islands. An enticing wall dive that drops to the white sandy bottom at depths of more than 30 metres. Healthy reefs, comprised of hard corals and colourful soft corals and fans, encircle the island. You could be forgiven for thinking you were in the Similans when you're underwater, with the rock formations and clean white sandy bottom.

There is a pair of submerged caves on the southeastern side of the island. The first cave entrance is at about 13 metres and tapers the further you enter. In 2002, a diver entered this cave and failed to emerge. His body was later retrieved from the cave and it's assumed he became stressed and panicked. Unable to surface he unfortunately drowned. For this reason, we strongly advise not entering underwater caves unless you have the required training, equipment and experience.

The other cave entrance is just a bit to the east of the first. This cave is known as the Twin Cathedrals. It's much larger than the first cave and poses little danger as it is well illuminated and spacious. Inside there is a swim through at about 8 metres into the second chamber from where divers can exit back into the blue. There is also another smaller swim through at 12 metres providing an alternate exit point, usually populated by Copper Sweepers, Squirrel Fish and Soldier Fish.

Soft corals and fans permeate the walls just outside the caves. Outside the caves Leopard Sharks are common guests, as are Blue Spotted Stingrays, Yellowtail Barracuda and Turtles.  Some Ghost Pipefish can even be found hovering next to some of the fans that sprout from the limestone wall. Remember to cast an eye out into the blue now and again as Whalesharks are sometimes spotted feeding around Koh Haa.