Koh Hah Dive Spots

The Dive Sites of Koh Hah and Their Special Features

The five uninhabited islets of Koh Hah lie far from the mainland in the open sea. They rise out of nowhere on a shared base and, with their jungle-covered, dramatic limestone formations, offer an overwhelming backdrop in the blue Andaman Sea.
In this emptiness, they attract marine life from all around — and not only fish. Many divers also love the dive sites of Koh Hah.

Dive Spots Koh Hah – The Cathedral

It is one of the most beautiful dive sites of Koh Hah and all of Thailand. In the steep wall of the first island lies a huge cave consisting of two chambers. You enter the cave from one side, and as soon as you approach the back wall and turn around, you are greeted with an overwhelming view of the barn-sized entrance, the second chamber beside it, and the overhanging cliff wall in front of it.
Because the entrances to both chambers are very large, there is daylight everywhere, and you only need a torch for photography. If you ascend along the back wall of the cave to about 6 meters and look toward the exit, a massive stalactite hangs down from the ceiling — a panorama that takes your breath away.
In the second chamber, you can surface. You then find yourself inside a huge dome of stalactites. There you experience a strange effect: from one second to the next, you are suddenly surrounded by dense fog, like in London. A few seconds later, the visibility becomes completely clear again! This happens because when the wave falls, the air inside the dome expands and the water vapor condenses into fog. When the wave rises again, the air is compressed and the fog disappears.

When you leave the cave, you cross a shallow plateau covered with whip corals that leads to a steep slope. At its base stands a boulder the size of a three-family house, featuring an overhang and crevices. It is covered in soft corals in every shade of color and populated by dense clouds of juvenile fish. These, in turn, attract medium and large predators in great numbers.
Continuing at a depth of 20 meters, you reach a series of house-sized boulders similar to the first one — or you can venture deeper into open water. There, divers encounter massive rocks so densely covered with soft corals, sea fans, and anemones that the actual stone beneath is no longer visible.
Large to enormous groupers live here by the dozen! Schools of big barracudas, trevallies, sharks, and large rays are also commonly found. The dive sites of Koh Hah offer an incredible amount, and this particular dive spot provides practically everything a diver could hope for.

Dive Spots Koh Hah – The Chapel

This dive leads across a gently sloping sandy area along a coral-covered slope to a field of purple soft corals. There you find large groupers, schools of yellow and white snappers, and a school of silver sweetlips.
The route continues along steep walls and overhangs adorned with beautiful gorgonians and soft corals, past large boulders that form narrow canyons in places, until you reach a small cave entrance at 18 meters. As soon as you swim inside, the bottom rises and you enter a large dome with a hole in the ceiling. Sunlight filters through this opening, illuminating part of the densely packed cardinalfish inside.
The atmosphere is reminiscent of the Sistine Chapel — hence the name of the dive site. You can ascend through the hole in the ceiling and end up in shallow water above the steep wall. From there, it is only a few fin kicks to another large grotto in the island wall. This one has several exits separated by thick rock pillars. Here too, dense schools of fish create a magnificent scene.
Another highlight among the dive sites of Koh Hah.

Dive Spots Koh Hah – Whale Graveyard and the Dream Bay

In the center of Koh Hah lies a small islet with a beautiful beach that becomes submerged at high tide — along with two massive limestone rocks. Together, they create a stunning panorama.
You can enjoy wonderful diving all around this formation. And on the west side, at a depth of 30 meters, lies a huge whale skeleton that is completely preserved. The skull, with its beak-shaped snout, is larger than a person. The spine stretches across the sand at nearly one meter in height along its entire length, and the collapsed rib arches decorate the front section of the skeleton.

Dive Spots Koh Hah – The Outer Reef

Among the dive sites in Koh Hah, the Outer Reef is a very demanding diving area. At the eastern tip of the island group, a steep wall descends underwater to depths of up to 40 meters, featuring beautiful coral growth as well as crevices and caves that provide shelter for many marine creatures.
Further out, in deeper water, lies an impressive field of soft corals growing in the sand, standing upright like a wheat field in full bloom. Large schools of fish, groupers, and visitors from the open sea gather there.
At the end of the steep wall, you return on the opposite side into shallow water with huge blocks of hard corals in front. Large beige stingrays are often seen mating there, and juvenile emperor fish are frequently found as well.