Koh Haa
Koh Haa Yai caves (The Cathedral)
- Max depth40 m
- CertificationCavern
- Water temperature≈ 29–30 °C, varies with the seasonestimated, no reports yet
Diving and fills
Dive here with
The dive
Through the swim-through to the right of the large entrance you reach the main cave, where you drop down a little.
Profile and sections
Through the swim-through to the right of the large entrance you reach the main cave, where you drop down a little. Inside it gets dark, but the light from the entrance below you makes the rock formations glow, and in one of the chambers you can surface under ancient stalactites hanging from the ceiling. The Cathedral owes its name to the light reflected from the surface. Visibility is usually 20–40 m.
Koh Haa Yai is the largest island of the group; on its south-east side two caves lie side by side, the first with an entrance that narrows inside, the second roomy and bright, with a split entrance.
Practical: Phoenix Divers goes there on day trips with three dives. Dive The World recommends sunrise dives to see the light in the chambers. At low tide snorkellers and freedivers also swim into the caves.
- Depth and profile
- Plan for 40 m: Aussie Divers gives the site as 5–40 m, Phoenix Divers 35 m at most; the wall drops to ~30 m onto sand. The first cave has its entrance at 12 m and narrows inside. The Cathedral has two chambers, with the main entrance at 14 m and an opening that runs up to the surface; you can surface in a chamber.
- Configuration
- Large entrances with daylight: recreational gear with a torch, within reach of the light (estimate). For the narrower first cave, cavern training.
Who can dive where
- At least Cavern
- Configurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
- Goes down to 40 m (trimix or deco may be needed)
This is how the planner decides who in your team may dive this cave. Rules your own trip adds (organizer, a mail, the AI) show with your trip.
How to get there
Boat dive on the south-east side of Koh Haa Yai, on a day trip from Ko Lanta or a liveaboard from Phuket. Dive with an experienced guide from a dive centre. Phoenix Divers takes all levels into the Cathedral; according to Aussie Divers you don't go into the first cave without training.
Around Koh Haa Yai caves (The Cathedral)
FillsNo fill station known nearby
Going to Koh Haa with your team?
Marcel finds the sites that match your team's certifications.
Plan a trip