Koh Tachai

Koh Tachai

2 Dives / Lunch on MV Koon 9 - Full Day

5,400 THB / PERSON

Pay extra for national park entrance fee 300 THB for Thai people / 700 THB for Foreigner
Pay extra for Equipment rental full set 500 THB
Dive computer 300 THB/Day

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** This Trip Is For Certified / Licensed Divers Only **

If you are not a certified/licensed diver please go to this link

For your day trip, we take you out on a fast transfer speed boat. It takes about 1.30 hours to reach the dive site, where you will rendezvous with our spacious dive boat, the MV Koon 9.

After a warm welcome aboard and a thorough briefing, you will get ready for their first dive. We dive in small groups to give you the best possible service and experience.

After the first dive, you will return to the MV Koon 9 for a buffet lunch and a more relaxed and extended surface interval. During lunch, there is plenty of time to sunbathe on our sun deck and relax. If you're feeling hot, then take a cooling break in the air-conditioned lounge before the second dive.

After the day’s excitement, the speed boat is ready and waiting to take you back to the Pier, returning at approximately 17:00 for transfers back to your hotel or resort.

Koh Tachai Pinnacle

Koh Tachai Pinnacle

Koh Tachai Pinnacle, on a good day, may very well compete with Richelieu Rock for the title of best Thailand dive site. This group of submerged boulders is, on most days, crossed by very particular (often strong) currents that attract an incredible amount of predatory fish in schools. With a bit of luck, especially between January and May, Mantas and Whalesharks can also be encountered here! Koh Tachai Pinnacle is made by a submerged group of gigantic granite boulders that remind of the Similan Islands dive sites. The summit is at around 10 meters of depth and has a mooring line/buoy to assist divers in their descent. There are actually two pinnacles, the main pinnacle in the south is bigger and is the area where most dives at Koh Tachai Pinnacle take place. It is made by a huge dome-shape boulder surrounded by many other smaller ones. The scenery on the pinnacle is very diverse, as the southern side is characterized by large and oddly shaped boulders that create a stunning underwater scenery, while on the north side lays one of the most beautiful and pristine coral gardens in Thailand. This huge pinnacle connects to the smaller second pinnacle to the north through a sand patch at 24 meters, with an approximately 50 meters long swim. The top of the northern pinnacle lies at 18 meters of depth, and comprises a wide range of rock formations and is home to large and beautiful sea fans and soft corals in pristine conditions. But the amazing underwater topography and coral reef pale in comparison to the insane amount of fish and marine life that can be found at Koh Tachai Pinnacle. Large schools of huge Giant Trevally, Bluefin Trevally, Dogtooth Tunas and Rainbow runners are often hunting around the boulders offering a spectacular show for the divers. A massive school of Chevron Barracudas is occasionally found whirlpooling over the pinnacles. Large Marble Groupers literally all over the place,  and schools of curious Batfish often keep us company during the safety stop. And these are just the major highlights, but there is much much more to be spotted here, including occasional passage of Manta Rays and Whalesharks when lucky! One dive is simply not enough to fully enjoy this amazing dive site. More often than not, the current at Koh Tachai Pinnacle can be very strong and that’s why the dive site is teeming with so much life. This can make it a challenging dive, although it can be easily managed by hiding behind the boulders and swimming close to the bottom.


Diving insurance
Free transfer around Khaolak, Namkhem charge 500 THB/Pax
Extend Night 5000THB / Day
Nitrox 300THB / Tank, Divers 19 dives up free Nitrox 1tank/pax/day, Divelead free Nitrox 1tank/pax/day
15L air tank for rent 300THB/day
Price included Vat


Park fee
Equipment Rental
Free transfer around Khaolak, Namkhem (Phuket, Out of Khaolak, Namkhem charge 500THB/Pax)
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MV Koon 9 - Weekly Plan Day Trip

10:30 First Dive/ 14:00 Second Dive 

Dive 1
Dive 2
SundayRichelieu RockRichelieu Rock
MondaySurin IslandsSurin Islands
WednesdayKoh BonKoh Bon
ThursdaySimilan Island no.5-6Similan Island no.7
FridaySimilan Island no. 9Similan Island no. 9
SaturdayTachai PinnacleTachai Pinnacle
Boat Schedule - Richelieu Rock
SundayNot Available-
MondaySimilan Islands ( Lunch on the Similan Island No.4 )2 Dives
TuesdayNot Available-
WednesdayNot Available-
ThursdayNot Available-
FridaySimilan Islands ( Lunch on the Similan Island No.4 )2 Dives
SaturdayNot Available-



06.30 - 7:30

Pickup from hotels


The Seastar team welcomes you on board at Seastar Pier (Tub-lamu Pier) to check in. Serve you with hot drinks and a bakery.


Depart to MV Koon 9 by speedboat.


Arrive at our spacious boat, MV Koon 9. Dive No. 1 at Koh Tachai (diving time: 50 minutes)


Enjoy a great lunch on MV Koon 9 and a relaxing time.


Dive No. 2 at Koh Tachai (dive time: 50 minutes)


Depart from MV Koon 9 by speedboat


Arrive at Seastar Pier (Tub-lamu Pier).and transfer back to your hotel.

More Information

Phone: +6684-156-9514


Booking Day Trip: [email protected]
Booking Liveaboard: [email protected]




Pick up from hotels or meet at Sea Sky Travel Pier


Departure from Sea Sky Travel Pier by speed boat


Arrive at the dive site


First dive (Diving time 50 minutes)


Lunch Buffet at Surin Island and relaxing time


Leaving the Island


Second dive (Diving time 50 minutes)


Depart from Dive site


Arrive at the Sea Sky Travel Pier and transfer back to hotel

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