Koh Haa Yai (Cathedral)

Type:

Scuba Diving

Entry:⚓Boat Entry

Difficulty:Advanced

Tags:

Cave

About This Dive Spot

Koh Haa Yai is the largest island in the Koh Haa group and is known for three large caverns on its southwest side. Two of the caverns connect through a large round swim-through, and the biggest chamber is commonly called “The Cathedral”. Divers come here for cavern exploration and the chance to see small critters as well as occasional pelagic encounters on the western side.

Safety & access

Hazards, restrictions, and required precautions.

Hazards

Overhead environment

Safety notes

The site includes caverns and a swim-through, creating an overhead environment.

Local intel

Community notes to help plan your visit.

Tailored notes for different activities.

Scuba

Features three large caverns and a connecting swim-through, including a large chamber known as The Cathedral.

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Spots Near Koh Haa Yai (Cathedral)

📍 1.2 km

Koh Haa #2

⚓

Koh Haa #2 is a small island dive with a gentle, slow-sloping profile on the northeast side of a lagoon area. The dive begins shallow and gradually descends to deeper water, making it approachable for a wide range of experience levels. The site is described as rich in corals and sea life, with a specific caution for territorial titan triggerfish on the south-side slope.

📍 29.3 km

Koh Bida Nai

⚓

Koh Bida Nai is a small rocky island in the Phi Phi Islands area, formed by limestone cliffs and known for a rich variety of marine life. The dive begins in shallow water and continues down along the island’s structure. Depths start around 5 m and extend to 30 m and beyond, offering a range from easy shallow exploration to deeper sections for experienced divers.

📍 30.0 km

Koh Rok Noi

Not Set

Hin Ngam lies off the southwest side of Koh Rok Noi and is a rocky dive site with abundant hard and soft corals. The area is known for macro life such as shrimp and nudibranchs, along with sea cucumbers and reef fish including angelfish, surgeonfish, and moray eels. Anemones with clownfish are also found here, and turtles may be seen.

📍 31.4 km

Pileh Wall 2

⚓

Pileh Wall 2 is a vibrant wall dive featuring a steep drop-off down to around 20 m. The site is known for its colorful soft corals and gorgonian fans, creating a bright reefscape along the wall. Divers can expect abundant reef fish and may encounter blacktip reef sharks in the shallower areas, along with moray eels and occasional turtles. It is described as suitable for divers of all levels.

📍 32.4 km

Palong Wall

Not Set

Palong Wall is a wall-diving site featuring dramatic underwater cliffs with sloping reef sections. The terrain includes small caverns and swim-throughs that add variety to the dive. Depths reach about 18 m and currents are typically mild, making it suitable for a wide range of diver experience levels.

📍 32.4 km

Turtle Rock

⚓

Turtle Rock lies west of Phi Phi Lee Island and is dived at roughly 10–20 m. The site features a wall with bubble corals where sea turtles are seen feeding. Along the sandy bottom divers may spot stingrays, leopard sharks, and mantis shrimps. The northern area includes swim-throughs and coral bommies to explore.

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Frequently Asked Questions

What's the best entry point at Koh Haa Yai (Cathedral)?

Entry at Koh Haa Yai (Cathedral) is detailed in the spot description above. Look for specific landmarks, access paths, and any tide or condition requirements. Local divers often share updated entry tips in their dive logs.

What conditions are best for diving Koh Haa Yai (Cathedral)?

Optimal conditions at Koh Haa Yai (Cathedral) depend on several factors including tide, wind, and season. Check recent dive logs for current condition reports and patterns. Generally, calmer seas and high tide provide better visibility and easier entry.

What is the maximum depth and typical visibility at Koh Haa Yai (Cathedral)?

Depth and visibility information for Koh Haa Yai (Cathedral) can be found in the spot details and recent dive logs. Conditions can vary significantly based on weather, tide, and season. Always plan your dive according to current conditions and your certification level.

Are there any safety considerations or local etiquette at Koh Haa Yai (Cathedral)?

When diving Koh Haa Yai (Cathedral), respect local regulations, marine life, and other water users. Be aware of any specific hazards like currents or boat traffic mentioned in the spot description. Follow Leave No Trace principles and local diving etiquette.