Similan Dive Center diving liveaboards and daytrips
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Day trip diving boat MV Charonia to Koh Bon and Koh Tachai

Surin islands and Koh Bon / Koh Tachai diving on HSC Charonia

Get the most out of your Khao Lak diving experience by joining a diving day trip to Koh Bon and Koh Tachai , Surin islands and Richelieu rock with 2 or 3  dives in the crystal waters of the Andaman Sea.

Koh Bon is a remote small uninhabited island which belongs to the Similan Islands National Marine Park. It’s located about 20 kilometers north of Similan Island No 9. The island has the shape of a horseshoe and no beaches. It is made of volcanic rock and over time waves and currents have cut some holes right through the island where you can see the waves surge through them both above and below the surface.

Koh Bon

Around Koh Bon, there are a few different dive sites what also give you different types of diving (Wall, Slope, Reef, and Drift) and it is considered the number 1 place in Thailand to see Manta Rays.

The West Ridge is the favorite amongst most divers and located at the southwest corner of the island. The southern part is a step-down wall that falls down to 40+ meters and is covered in tiny colorful soft corals and beautiful sea fans of different sizes, shapes, and colors.

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The cracks in the wall accommodate a vast amount of little critters like shrimps of all kinds, tiny crabs and many amazing nudibranchs. . . heaven for macro photographers, so makes sure you have enough batteries and a big memory card with you!

Coral Bommies

The northern side of the ridge is more of a gentle slope with coral bommies forming mushroom-like formations out of the hard corals. Some of these big coral heads are covered in butterfly fish and known as cleaner stations for the majestic Manta Rays. They love to hang out with us, get cleaned and play with our bubbles; all you do is sit back and enjoy the show.

The Reef

The Reef slopes from a depth of 10 meters down to the sandy bottom at 25 to 30 meters. The majority of corals here are hard corals including staghorn coral, table coral, and brain coral and you will find an abundance of life due to the usually medium to strong currents but this is what brings in the big fish. Schooling fish like barracudas, trevallies, snappers, and batfish swim into the current and there two huge napoleon wrasses around as well. If you are really lucky you might even see a small Blacktip Reefshark or a Leopard Shark.

The Bay is framed by the wall of the ridge to the north and a steep wall to the east and usually more sheltered from the currents. It’s home to many Red Tooth Trigger Fish, Giant Moray Eels and Banded Sea Snakes.

Koh Tachai

Koh Tachai is one of the more northern dive sites and favorite by many divers. It is a small uninhabited island about halfway between the Similan Islands and the Surin Islands. The main features of diving here are a stunning landscape of the submerged pinnacles, large boulders, and the excellent marine life.

The Dome

This beautiful island provides a few dive sites which makes it suitable for every certification level, with Koh Tachai Plateau or ‘The Dome’ as the main dive site. It’s basically a gigantic round granite boulder (dome shape) with large boulders spread all around this central rock, creating swim-throughs, channels and coral plateaus rich in life. The top of the pinnacle is at 12 – 14 meters with a buoy for safe descent and drops down to the sand bottom at a depth of 30 to 40 meters, with the deepest area on the southern side.

Coral Garden

The top of the plateau is a big coral garden built with excellent specimens of hard coral while deeper parts are known to have many boulders, pinnacles, and the biggest and most beautiful sea fans and gorgonians in the entire Similan Island National Marine Park.

It’s also a good place to spot Napoleon wrasses, giant groupers, turtles, black tip reef sharks, nurse sharks and occasional white tip or grey reef sharks. With stronger currents the majestic manta rays and the king of all marine animals, the whale shark show up around Koh Tachai.

Great Baracuda

Other more common species such as great barracudas, yellow-backed fusiliers, bannerfish and hunting giant trevallies and tunas can be found here in large shoals. Between the rocks, you might see banded sea snakes, while different kind of moray eels and lobsters hiding in holes and crevices. Inside corals and cracks a vast number of small critters like mantis shrimps, ghost pipefish, nudibranchs, and even seahorses, waiting to be discovered. In the deeper water, you might even be lucky to find leopard sharks and different kind of stingrays resting on the sand.

Underwater photographer

If you are an underwater photographer, you don’t want to miss out. . . bring the big memory card and enough batteries! Koh Tachai’s dive sites offer everything, from stunning landscapes to macro life and big fish encounters.

The boat for this Khao Lak scuba diving trip will be the HSC Charonia, one of the spacious day trip boats around. This multihull day trip boat offers a comfortable ride; it takes about 1 hour to reach Koh Bon. The sundeck gives you extra space to relax during the surface interval.
Dive groups are based on certification level and dive experience. In this way, everybody will feel comfortable: from novice open water diver to the more experienced diver. The ratio is 4 divers to 1 Dive Master. Each Dive Master gives a detailed dive briefing to his group and helps you with setting up your diving gear. Dive time will be 45-60 minutes.

Relax between the dives

Between the dives, lunch is served on the boat and you get some time to tan on the sundeck, snorkel or just relax.
After the second dive, you might exchange experiences with the other participants and fill in your log book while enjoying fresh fruits or having a cold drink.

BOOK NOW
  • Diving day trip from Khao Lak
  • 2 or 3 Dives
  • Surin islands, Koh Bon, Koh Tachai, Richelieu rock
  • Max 4 divers with 1 professional guide
  • Breakfast and Lunch on the boat
  • Best price guarantee
  • Book with local diving experts
  •  
  • PRICE
  • INCLUDED
  • EXCLUDED
  • ITINERARY
  • SCHEDULE
  • DIVE SITES
  • MAKE YOUR BOOKING

Surin islands daytrip 2 dives : 4.900.- Baht

Koh Bon / Koh Tachai daytrip 2 dives : 4.900.- Baht

Koh Bon / Koh Tachai daytrip 3 dives : 5.600.- Baht

Richelieu rock daytrip 2 dives : 4.900.- Baht

 

Included in the price are :

 

  • Experienced dive guides and instructors 
  • Small dive groups of 4  divers to 1 dive guide
  • Lunch, fruits and snacks
  • Drinking water, tea and coffee
  • Towels
  • 12 Liter tanks
  • Weightbelt
  • Transfers for Khao Lak area 

Excluded in the price are :

 

  • National park entrance and diving fees : 700.- Baht
  • Full set of diving equipment : 500.- Baht per day
  • 15 Liter tank : 150.- Baht per dive
  • Nitrox 32 % : 150.- Baht per dive
  • Dive computer : 250.- Baht per day
  • Soft drinks and beers ( can be purchased at the boat, alcoholic only after the last dive )

Itinerary

Pick up from your accommodation in Khao Lak.
At 8.00 AM the HSC Chariona leaves to the dive site from Baan Nahmkem pier. The travel time is around one and a halve hour.

The friendly and experienced crew welcome you onboard on the comfortable dive boat. The boat master gives a short boat briefing.

Dive groups

Dive groups are based on certification level and dive experience. In this way everybody will feel themselves comfortable: from novice open water diver to the more experienced diver. The ratio is 4 divers to 1 Dive Master. Each Dive Master gives a detailed dive briefing to his group and helps you with setting up your diving gear.
Plunge into the crystal clear water and enjoy the incredible marine wildlife. Dive time 45-60 minutes.

Surface interval

Back onboard a lunch is served . During the surface interval there is to relax or to sunbathe on the sundeck.

Time for the second dive, your Dive Master gives a detailed dive briefing and will help you with gearing up.
Plunge back into the water and get the experience of world-class diving.

After the last dive fresh fruit are served. The HSC Chariona starts returning back to Baan Nahmkhem pier. This will give you enough time to fill in your logbook, exchange experiences and have a drink The arrival time is around 17.00 PM . A taxi is waiting to bring you back to your accommodation in Khao Lak.

On the 3 dives trip the arrival time is about two hours later

Schedule can be changed due weather, sea conditions, instructions by the national park authorities.    

Schedule MV Sundancer

Monday   Koh Bon / Koh Tachai Experienced divers only
2 Dives          
           
Tuesday   Surin islands  
2 Dives          
           
Wednesday Koh Bon / Koh Tachai Experienced divers only
3 Dives          
           
Thursday   Richelieu rock Experienced divers only
2 dives          
           
Friday   Surin islands    
2 Dives          
           
Saturday   Similan islands no 9    
2 Dives          
           
Sunday   Richelieu rock     Experienced divers only
2 Dives           

 

Dive map and information about Koh Tachai Manta point Koh Bon dive map and information

Make your booking with Similan Dive Center

DIVE SITES
Information and dive map about the Koh Bon dive site
Information and dive map about the Richelieu rock dive site
Information and dive map about the Koh Tachai dive site
Dive deck on the Mv Charonia
Dive briefing on the MV Charonia
Enoying the sundeck on MV Charonia
Sundeck on Koh Bon diving day trip boat
Manta ray at Koh Bon on a diving trip on the MV Chay Yo
See the nudibranch on a Koh Tachai diving daytrip with the MV Chay Yo
Trevally at Koh Tachai on a diving datrip on the MV Chay Yo

WHY BOOK WITH SIMILAN DIVE CENTER?

Best selection of Thailand liveaboards
Similan Dive Center guarantuee the best price for the scuba diving trips
No hidden fees on the Similan Dive Center prices
Similan Dive Center is a certified dive center
Similan Dive Center local diving experts
Similan Dive Center has a local office at the harbor where the dive trips depart

MISSION & VISION

Similan Dive Center is a diving shop, run by a group of passionate local divers who come together to share our enthusiasm for diving as well as the love for nature. At Similan Dive Center, book from our meticulously handpicked and curated list of the most popular liveaboards and diving day trips.

With 20 years of experience, we offer a personal service, always trying to make that extra step. Get the best out of your diving holiday by contacting us by e-mail, telephone or walk-in at our shop in Khao Lak.

Similan Dive Center

67/7 Moo 5 Khuekkhak,
Takuapa, Thailand 82220
Thailand
Phone: +66 831 761 306
Secondary phone: +66 76 490 965
Email: info@similandivecenter.com

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